Rhayna scratches her head and thinks to herself. “Kastix really wants to open that sarcophagus...”

"I really want something to make the trouble we've gone through," Kastix growls before looking at Erky?, "Toss a beast out,"

Erky sighed, but he said his piece and was not heed, so, he could as well try to help. "Not sure what a gnome like myself can do where a mighty warriors failed but I can try."

1. 10

2. 8

(Everyone can roll with advantage, so I took Erky's two rolls as one single failed attempt)

The bookish gnome struggles valiantly against the one of the two remaining rusty latches to no avail

1) Kastix fail, Ireniana fail, Royan PASS - open
2) Kastix fail, Erky fail
3) Kastix fail
4) Kastix PASS - open
5) Kastix PASS - open
6) Kastix PASS - open

(Yeah, I'm probably dragging this out, but doesn't it make you more curious??)

Ireniana Athletics check

Strength 1: 16

Strength 2: 21

(@Ireniana: Athletics doesn't really apply in the case of opening latches, but I'll accept the rolls, which are clearly successes!)

Ireniana takes up Kastix's discarded crowbar, and with a flex of her slender but powerful muscles, flicks open both latches, with the second latch actually coming free of the sarcophagus. Working together, Royan and Ireniana are then able to push the lid off the sarcophagus. As the lid slides away from the coffin, there is a flash of green light, and Kaylyn's residual magical detection senses suddenly tingle, as if something that she should have been able to sense before had been magically hidden from her. Those beside the coffin peek inside...

In the coffin is the body of a troll! It is dressed in rotted finery, but its jewelry and rings still sparkle, and several items placed around the body seem untouched by time. The creature's body is shrunken and elongated, and its flesh is a rubbery, putrid green. Its black hair is long, thick, and ropy.

As you are staring at the body, its beady black eyes flash open. Seeing the faces peering down from above it, it snarls.

Roll Initiative! Also declare your intended actions, and make any associated rolls.

"Did not I tell so? Yes, I did. And now he is attacking us and we can not even blame poor creature, whose rest we disturbed."

Erky stepped back and prepared himself to help as best as he could, reaching inside his Bag-of-Tricks, getting out the fur-ball and tossing it onto ground (just in case 6 ).

Initiative: 7

Initiative: 19

Rhayna cast Bless on Ireniana, Royan, and Kaylyn. She will keep her distance from the creature.

Initiative  6

Kaylyn looks over at the coffin from her position in the corner of the room.  

"What's magical in there?  I sense magic now that you have opened it."

When the monster appears she sends crackling energy fly at the creature.

Eldritch Blast

Attack: 17 Damage: 14

Plus Bless if it lands that way with initiative 9

uh, oops meant to roll a d4 4

Initiative 18

Kastix fires his Fire Bolt, "Just stay down! I just want your stuff! Ignis!"

Attack: 16 Damage: 3 

Initiative - 20

Ireniana is going to take out her sword and thrust them into the troll's body. "Sorry friend, you're better off dead."

Attack: 14 Damage: 4 - Bless 1

Attack: 16 Damage: 4 - Bless 4

A Giant Weasel was not exactly the creature Erky hoped for, but it had to do for now. Not sure whether the animal will listen to him, he ordered it to attack the troll.

While weasel was on it, Erky tried to manage attack of his own:

Sacred Flame (save Dex 12) 7

Initiative - 20

"I knew it was locked for a reason," Royan growls as the eyes flash open. As quick as he can, Royan interposes himself between Kastix and the sarcophagus. He then, frustrated with the situation and the groups blind need to disturb the dead, enters a state of rage.

As the troll wakes, royan strikes out at it with his longsword. Attack: 11 Damage: 14

(My apologies, but I won't be able to respond for another 24 hours. Please allow the tension to continue to build...)

COMBAT:

The troll rises suddenly from the sarcophagus, lashing out wildly with its gangly clawed arms, seemingly even before it is fully aware of its surroundings. One flailing claw merely hits the edge of the sarcophagus beside Royan, but the other gouges a deep gash across Ireniana's stomach.

Rhayna stretches forth her arms, calling on Selune to bestow her blessing light on her companions' in battle. From the opposite corner of the room, Kaylyn summons arcane energy and sends it careening toward the troll, but its erratic movements cause it to avoid the blast, which hits the wall not far from Rhayn's head.

At the side of the sarcophagus, Royan and Ireniana retaliate against the giant creature. Despite Royan's temper reaching boiling point, their experience fighting together over the past days allows him and Ireniana to coordinate their attacks, and they strike several times at the rubbery flesh, which starts to ooze black fluid, staining the troll's rotting garments.

Facing a foe larger even than the white dragon, Erky thinks quickly and draws a round-fuzzy from his bag of fuzzies. As he casts it to the ground, in a puff of smoke a long slender furry mammal appears, reaching taller than Erky himself as it rears on its hind legs. Encouraged at this, Erky commands the weasel to engage with the troll and aid his companions.

From the far corner, Kastix growls his command word and launches a ball of fire at the troll. Although it barely impacts it on the lower leg, the flesh sizzles loudly with a sharp tangy smell, and the troll reacts to the pain even more severely than to the wounds from the blades. Turning to face the source of the searing fire, the troll sees Kastix in the corner and leaps out of the sarcophagus towards him, flailing its long clawed arms in fury.

Kastix is down, Royan and Ireniana are injured, as is the troll. Ireniana and Ron Weasel can both take opportunity attacks against the troll as it moves out of their reach. Include these in your post along with your Round 2 actions. Everyone else can proceed with Round 2 actions.

@Erky: summoning the giant weasel (I'll call him Ron) constitutes your action for the turn, so I've moved Sacred Flame to turn 2. However you can command Ron with your bonus action, so that can stay in turn 1, and Ron will perform the action in turn 2.

Royan sees Kastix fall. There was nothing he could do for his companion at the moment except try to take down the troll as quickly as possible. Royan swings his longsword again.

Longsword - Attack: 19 Damage: 9

Death Saving Throw: 6

Sure, I counted it as "interaction with the object" but may be it was too much for one.

For the Round 2 Erky runs as close to Kastix as possible and casts "Healing Word 4

@Erky:

Just going with the rules for Bag of Tricks which actually state that it takes an action. 

Did you want to be CLOSER, or just be in range and able to see him? I'd allow just about anything, but considering the sarcophagus and the troll are between you and the tiefling, who is on the floor, I'd suggest move into the corner where Rhayna is. That puts you in range and in line of sight, and puts the barbarian between you and the troll.

Also: reminder - you can use the bag of tricks 3 times in one day. Each time will take an action.

Also: Did you still want to use Sacred Flame as well as Healing Word? Can do both in same turn!

Also: Did you want to roll the opportunity attack/damage for the Giant Weasel?

Since Erky is before Kastix and healed him,  Kastix using half his movement getting up and move north  next to Royan and prepare Dodge.