Distraction:

Burr strides to the front of the church, hollering his challenge for Gregor.  The two guards by the door, and those on the nearby pedestals ('towers' is too grandiose a term for the low platforms of wood they stand upon) are taken aback.  The two guards flanking the desecrated entrance look at each other, visibly shaken.  One of them, younger, takes half a step back before catching himself.  The other shifts his grip on his halberd and calls over his shoulder, "Gregor!  Gregor, he's calling you out!"  

There is some noise from inside the cathedral, and several moments pass without anyone emerging from inside.  Outside, the guards do not attack, but all of them watch Burr warily, their crossbows raised.

Infiltration:

Zefla and teeny tiny Soren clear the low iron fence on the west side of the cathedral and slip in the doors, quiet as a mouse.  

They find themselves and a stone landing on a circular staircase.  Before them, another set of doors leads into the cathedral.  Light is visible under the door, and voices can be heard.  Outside, the ruckus of Burr's distraction cannot be ignored.

Above, the spiral stone stairs lead up nearly four stories to the belltower, where two guards are waiting, unaware yet of your incursion.  Below, the stairs lead down into darkness, into the church basement Soren only vaguely recalls,  it appears to be completely dark in that direction.

Outside, Giles, Tobias and his guards wait somewhere ill-defined and to be established later if/when it becomes necessary.

Spider-Soren clings to a fold in Zefla's cloak, unable to see (much) or speak (at all) for the moment, though he can listen and hear.

Waiting for a signal to transform back (and perhaps re-summon Nettle) if need be.

Burr makes a bit of a show about having to wait scuffing the dirt and chuckling to himself....

Taking note of what her mission was, Zefla creeps up the stairs hoping the noises between Burr and the others increase in case taking out these guards becomes noisier than she's hoping for.  She unsheathes her shortsword and holds it in her dominate hand, dagger in her offhand as she continues upward.

With the Blessing of the Trickster, she continues using it's advantage:
Stealth 30

Inside:

Zefla is as quiet as a mouse as she creeps up the tower, step after step.  Soon, she is peering over the threshold of the belltower.  Two guards are here, both peering down toward the main entrance, crossbows trained on Burr far below.

"Did I hear that guy right?"

"Hrrmph.  This should be good.  I was gettin' bored up here."

[Is Zefla planning to alert Soren and attack?  If so..

Initiative:  

Zefla:  14

Soren: 12

Guards:  13

The guards are surprised and will not have an action the first round.   So order will be Zefla > Soren > Zefla > Guards > Soren....]

Outside

Burr continues to wait outside the church exit.  

Eventually, the thud of footsteps is heard and the heavy wooden door is thrown open.  Out steps a man, short and small of build, but well armed and armored.  He has the nicest looking breastplate of any of the guards you have seen here and he is adorned in a fine cloak collared with white wolf's fur.

"What's all this?  What now?  I'm busy securing our position in this town.  I was not to be interrupted," he growls at the two guards.  

One of the points his crossbow at Burr.  "Mister Fiendbreaker here wants to challenge you to single combat."

Gregor glares at the guard for a moment, then turns incredulous eyes toward Burr.

" Well? C'mon then ye fecking treestump with eyes. I haven't got all day...neither of us do...."

Hearing the commotion increasing outside, Zefla smiles and in the tiniest of whispers, "Let's take them out." she tells Spider-Soren.

She comes up behind one of them, reaches up and stabs them in the back, attempting to puncture a lung..

Attack: 23, Damage: 7+4 sneak attack

Then takes her dagger and plunges it in the back as well..

Attack: 23, Damage: 4

(OOC:  it's Spider-Soren's turn, but he's waiting to check what the results of Zefla's initial attacks on the first guard are before deciding what to do, assuming he can see while clinging to a fold on Zefla's cloak .  Deciding whether or not to drop Wild Shape and transform back to his humanoid form as a bonus action is a big decision.)

Inside/Above:

Zefla's first blade stops the heart of the first guard, cutting short a remark about Burr down below.  Her second attack is just a glancing blow against the second guard.

Outside:

Holding until after the results of the belltower...

Spider-Soren remains a spider but leaps off Zefla's shoulder towards the surviving guard's right arm, floating as he trails a strand of webbing behind him.  As he lands, he scuttles along the guard's skin, under the his clothing, towards his chest and throat in the most discomforting way possible.

(Soren takes the help action against the surviving guard, granting advantage to Zefla's next attack.)

Sitting right behind the brush to the west, Giles and the crew are crouched down and waiting, listening and watching for the signal.  He holds his crossbow, occasionally pointed at the western entrance and occasionally towards the front door and this Gregor fellow in the breastplate.  As he’s crouched and they are hidden by pass without trace, he begins praying earnestly to Lady Tymora, saying “Dear Lady, you’ve got me out of scrapes uncounted, I can’t even begin to say how many.  I’m asking for your blessing again m’lady, as we attempt to pull off another one.  Dear lady, give me your power, give me your insight, give me your strength as I aid my friends, as we rush in to save this young man and his friends, caught in this vicious spiral of death in Vallaki.  I don’t even know where this is, but by walking your path, stepping where you would have me go, and walking by faith not by sight, I know that I’ll come through.  To continue to serve you, dear Lady.  Give me the strength.  Amen.”  

(Giles uses Harvest Divine Power to regain a second level spell slot while he is waiting for the signal.)

Satisfaction graces Zefla's face as she watches the first one fall.  Turning all her attention to the remaining one, she smirks a bit as she watches Soren-spider scuttle along the guard's skin.  Then she goes in for the attack.

Shortsword attack: 16, Damage: 7+12 sneak attack

Dagger if needed: 24, Damage: 4

(If the 16 didn't hit, apply the sneak attack to the dagger)

Assuming Zefla has slain the second guard and that there are no more enemies in sight occupying the tower:

As Spider-Soren leaps back to a fold in the (outside of the) shoulder of Zefla's cloak, he re-summons Nettle from her woodland pocket dimension.

Keeping to the shadows, the owl circles out of the tower to a concealed spot so she can be heard better by anyone near the cathedral.  Two hoots in quick succession sound through the gathering dark, audible to Burr, Giles and the rest of the group's allies, followed by a long pause, and then two more quick hoots.  (Two hoots having been the stated signal to indicate that the guards in the tower have been taken out.)

Once done, Nettle returns to the tower where Zefla and Spider-Soren are, and the druid dismisses her once more to her little forest dimension.

Upstairs:

Both guards are slain, and Soren's owl gives the signal.  From Below, Giles and the guards hiding with him just make out the sight of the two silhouettes in the bell tower falling quietly.

At the front door:

Gregor’s eyes narrow at Burr with immediate venom.  He squints, then points a gloved finger.  “Oh.  Ohhhhhh, is that so?  A 'feckless treestump, am I?”

“Well, I do admire your... suicidal spirit!”  He pauses dramatically, places one hand theatrically on his chestplate, then spreads his arms wide to the men below.

“Well?  What are you idiots waiting for?”

He draws a breath and suddenly shrieks:  “SHOOT HIM!!”

A flick of his hand sends the signal—more panicked than authoritative—and the guards immediately start fumbling with crossbows, caught between obedience, self-preservation, and wondering whether this is going to get very, very bad for them.

Gregor, meanwhile, backs up a half step toward the door even as he tries to look commanding.  “You’ll regret challenging me, 'Fiendbreaker!'  I don’t need to fight you—I have men for that!”  But even as he speaks, his eyes flick to the guards—checking if they’re actually going to do what he asked.

Initiative:

• Guards:  18
• Burr:  17
• Gregor:  7

The two guards in front of Burr hesitate, slightly cowed by his intimidating presence.  They fumble with their crossbows and raise them defensively but don't fire them.  The two guards at either end of the compound, however, have no qualms about firing shots off at Burr.

• Crossbow:  6
• Crossbow:  18  Piercing Damage:  6

On the east side of the compound, the six guards near the campfires hastily rise, grabbing swords and crossbows.

Finally, Giles and Tobias' men see one of the guards at the rear of the church begin jogging toward the front to see what the commotion is all about.

Burr is up!

[The red dots are guards.  The big maroon blob is where Giles, Tobias, and his men are hidden by Giles' spell.  Zefla and Soren are up in the top of the tower.]

Burr snaps off the bolt that has blossomed in his upper right pectoral and throws a wink the firers way, grinding his teeth through the pain,  and marches forward straight toward Gregor, " I called YOU out not your men, You Feckless Cowardly Quisling!!"

He spread his arms with the Blood spear high above his head, "  Is this the man to preserve you against the Fallen and Undead? Is this Useless Scrap of Filth going to keep you safe In The Dark?"

" Look Now! He flees behind doors, hides his quivering self behind braver men."

"  If you are too weak to face me yourself, choose a champion from among these better men to die in your place!!"

Burr’s voice echoes through the streets in front of the church in the late afternoon grey, stirring something restless in the gathered guards.  Some shift their stance.  Others glance up at Gregor.

Gregor’s fingers twitch around the hilt at his hip.  His eyes sweep the faces of his men and what he sees bothers him him more than Burr: doubt.

His face hardens for a moment, and then his sneer returns.  “Hah!  Dramatic words from a madman!” he snaps, trying to reassert control.  “You think this is how power works, savage?  You think waving a stick and bellowing at the moon makes you a leader?  You’re a joke.  And I don’t duel jokes.  I laugh at them!”

Then he looks to his guards again.  Measuring their hesitation.

Suddenly, he draws his own longsword with a metallic whisper.  He doesn't shout or warn.  He lunges.  Boots scraping stone, Gregor descends the steps and weaves between his guards.  Not charging, but moving fast, low, sword raised.  He slashes at Burr, overhand and backhand, and then pulls back to the steps.

• Longsword Attack:  22  Slashing Damage:  8
• Longsword Attack:  6

[Movement:  moves down from the steps through the space of his ally but doesn't end his turn there, moving back to the steps.  He cannot disengage so Burr may take an AOO.]

Even as the blade whistles through the air and he steps back, Gregor’s off-hand reaches out and pulls one of the guards back into Burr's path as he retreats behind the line. His wolf-fur cloak flares as he rises back onto the steps, shouting, “Kill this mad dog!  A bottle of brandy to the man or woman who brings me his head!”

[Does anyone else want to join the initiative?  Otherwise the guards are up next.]

Burr AoO- Attack: 13 Damage: 6

(Assuming the red dot to the west is a guard who is moving south to look into the sounds at the front of the church, to see what all of the hubbub is about, Giles and the main force will enter initiative.)

Giles says quietly from cover, “Break out your crossbows, when that guard is out of sight from the northwest corner, as he’s walking south, let’s take him out.  On my count.  Everyone fire at once.  When we drop him, I’ll use my mage hand to drag him into the bushes here.  The guard to the south is watching the show up front.  Let’s get ready, we are nearly ready to rush in.  Hear the hoots?  They've cleared the guards in the tower.  Burr is taking a couple of hits, but he’s tough.  He’s buying us valuable time…”

Giles initiative : 22

Crossbow bolt to the guard if he walks to an unobserved position due west of the church (at adv, hidden)  : (Nat 20, crit!) 26, for 8 points of piercing damage.  

(Giles says quietly “Fire!” and the rest of the crew fill him with bolts at the same time if possible.  If the guard falls, Giles uses his mage hand to pull him into the bushes, in cover.  They try to do this in timing with the shouting and hoopla up front.)

Zefla quickly checks the pockets of the guards that she had slain, looking for a key or anything that might be useful.  After that she slips back down the stairs of the tower, listening closely to the commotion going on at the front of the cathedral.  

Knowing time was not on their side and the way the guards on the tower acted, more concerned with Burr than keeping an eye out for others, she decides to continue the descend to the basement, thinking that between herself and Soren they can handle whatever is holding the kid down here.  Besides, with all of Burr's bravado, he wasn't invincible and she wanted Giles there to make sure he was ok.

If there is a door at the bottom, she will listen at it to try and ascertain what is going on.  If there is a lot of voices, it might make her pause.

Perception: 6 (nat 1)

The sounds of outside apparently cover whatever might be behind the door, so she opens it and slips inside...

Stealth w/adv (trickster): 19

If a spider could snarl, Soren does, at the sound, muffled by the folds in Zefla's cloak, of the coward below screaming for the murder of his friend.  He would like nothing more than to drop Wild Shape and ask Zefla to put an arrow in the dastard's back while Soren himself would call down searing moonlight upon his head.  Surely the rest of this Cathedral pack, however rabid, could be convinced to abandon the man.  Or at least not side with him.

Yet unlike in the windmill, Soren has no disagreement with Zefla's course of action.  Staying focused on freeing Emil and any other prisoners being held in the crypts.  He grits his teeth (to the extent a spider has teeth to grit) and continues clinging to her shoulder.