((Sorry for the delay. Help me if I’ve missed anything crucial. My understanding is that Larry stabilised Grandpa and everyone started heading further up. That it?))

Larry leaves Grandpa where he is, certain that the man is stable, and heads on up the stairs, as far as he can go after everyone else. He will engage the first enemy he sees, otherwise he will continue up to just behind the lead party member (not wanting to break any planned ambush or otherwise mess up their coordinated assault).

((With Move and Dash (or Step of Wind), Larry could get ahead of Bolt, Bryn and Patter, just behind Storm, who is at the doorway.))

((Sounds good. Larry awaits the big push but is ready)).

Larry scoots his way up to behind Storm.

((Using Move and Dash Action? Doing anything with BA? Or could have gotten there with Move + Step of the Wind and have an Action to hold?))

A [Tooltip Not Found] of spring through the doorway at Storm, who hastily throws up a shimmering shield of force, the darts being absorbed and vanishing.

The many-limbed creature moves up and slashes viciously at Storm in a blur of attacks.

Attack: 21 Damage: 9
Attack: 21 Damage: 7
Attack: 8 Damage: 12
Attack: 20 Damage: 6
Attack: 21 Damage: 7
Attack: 13 Damage: 8

Bolt 20
BB 18 
Bryn 15
Larry 14
Grandpa 13 
Storm's Pal
Grandpa's Stairway Friend 9
Keller 7
Storm 4 

Even with the protective magic, the creature's attacks find their way through, the first robbing Storm of his consciousness, while multiple others strike and slash at his body as it falls spurting to the ground, covering Larry in the blood of the man he met only a few minutes before.

In the moment of death, the unreleased chaos within your Commander burbles and crackles forth.

Storm Chaos: 28

 There is a rumbling thrum of power, and you all feel a tingle of chaotic potential wash over you.

Bolt 20
BB 18 
Bryn 15
Larry 14
Grandpa 13 
Storm's Pal
Grandpa's Stairway Friend 9
Keller 7 <---<<
Storm 4 

Storm Chaos: 38

 Storm's body begins rising up into the air, still dripping and crackling with energy.

Bolt 20
BB 18 
Bryn 15
Larry 14
Grandpa 13 
Storm's Pal
Grandpa's Stairway Friend 9
Keller 7 <---<<
Storm 4 

((omg that’s brutal! Eek!… No bonus action, Larry is fine where he is…. Traumatised, but fine!…))

Keller, horrified at what just happened to Storm, flings a hand out and chaos energy explodes from him, zipping around the corner to target the wizard and the evil thing from the stairway. 

(Bear with me here. Spending two sorcery points to quicken chaos bolt to a bonus action. I had a whole thing about using the Storm surge to cast chaos bolt twice and twinning both of them and quickening one to BA, but you can't twin chaos bolt, which I forgot. So my turn exploded itself. Picking up the pieces...)

Keller peeks at the abomination and shoots his crossbow, hopefully unseen and hidden. He also quickens a chaos bolt to hit the abomination with his BA.

Attack: 9 Damage: 9 plus 9 sneak attack damage

BA Chaos Bolt Attack: 14 Damage: 4 plus 4

((Since Keller had previously used Tides, casting Chaos Bolt triggers a Surge, so go ahead and roll that sweet sweet d100 for us!))

Keller snipes at the abomination, but it jerks back at the twang of his crossbow, the bolt burying itself in the wood of the doorjamb. His magical attack has more success, striking the creature squarely in the chest with (acid?/lightning?) as it hisses in anger.

((Party is up, but let's resolve Keller's chaos first?))

Chaos! 61

((Sorry! First week back, things got away from me!))

Keller feels a pressure building up inside his chest and throat.

((I'll let BB and Larry go first if you want, but can also give me actions for Bolt or Bryn if you want them to do something. Grandpa, let me know what you want Black to be doing?))

Bolt 20 <---<<
BB 18  <---<<
Bryn 15 <---<<
Larry 14 <---<<
Grandpa 13  <---<<
Storm's Pal
Grandpa's Stairway Friend 9
Keller 7
Storm 4 

((How's the window frame looking? Could it hold a largish man in heavy armor?))

((To be able to stand on it? Probably, you'd judge it would take some amount of effort to be able to push through, so would likely hold.))

((Sorry it’s been a while since my last go. I think someone just exploded near Larry. But maybe there’s an enemy nearby still? If so, they will attack-attack-dodge!…))

Larry attempts a swift kick, then a head-but!… before adopting a cautious stance, ready to dodge if need be…

Kick attack: Attack: 17 Damage: 6 (bludgeoning damage)

Head-butt attack: Attack: 5 Damage: 9 (bludgeoning damage)

Bonus action (-1Ki): ‘Patient defence’ ((ie, basically dodge )).

Larry is obviously still slightly traumatised by the recent death, and arcane explosion, that took place just feet from him!… 

Larry steps forward, under the levitating, crackling-with-chaos body of Storm, and unleashes a series of blows against the creature, which intercepts them easily with its many arms, turning his attacks to the side. Beyond the creature, Larry can see that the Mistress's workshop has been ransacked, but the glowing, crackling sphere of energy in the middle of the room seems active, pulsing and growing larger before shrinking, tendrils of crackling energy seeming to reach and writhe. They seem to be elongating in his direction... no, not towards him, but towards the body floating above him. There seems to be some sympathetic response in the energy swirling around Storm, static bursts and swirling energy being drawn towards the center of the room...

Bolt 20 <---<<
BB 18  <---<<
Bryn 15 <---<<
Larry 14
Grandpa 13  <---<<
Storm's Pal
Grandpa's Stairway Friend 9
Keller 7
Storm 4 

((Dang.))

BB smashes his way through the window and climbs in to the ceiling.

Attack one: Attack: 20 Damage: 8