BB's casual approach fails to yield dividends, as both blows are deflected wide by the leader's staff. It snarls and swings back at him.

Attack: 10 Damage: 11 bludgeoning plus 9 psychic damage and a CON Save if it hits please!

((Keller is 20 ft east of Black currently.))

Keller: 21  <-----<<
Grandpa: 19   <-----<<
Black: 19 (DEX Save, pls)   <-----<<
Larry: 15 (prone)  <-----<<
Brynn: 15   <-----<<
Bolt: 11  <-----<<
Skitterers: 8 (X,X/X/-X/-9/X)
Hulking Figure: 2 (-103) (oops, lost track... it's a lot)
BB: 2
Leader: 2 (-10)

Bolt carries on her assault, grinning, "Damn right you're surrounded.  Now just go down, big boy."

Attack 1: 14
Damage 1: 12

Attack 2: 27
Damage 2: 10

Giant's Might: 5

Bolt's first swing is ducked, but as she swings around with the backhand, it slams into the hulking creature.

((Feel free to flavor it up if you want, he was at 8 HP!))

Seeing the hulking figure go down, Gramps rushes towards the leader (can he still see him?) and orders Black to do so aswell. (Black will dash for sure, Gramps depends on if he can see the leader or not)

((Grandpa's movement gets him ~90 ft to the leader, who he can see on the far side of BB. Black is nearly able to catch up with Grandpa with their dash.))

(Couldn't tell if the giant's might was damage or not, and thus took down the big guy, but guess so!)

Keller barks, weakly, "nice hit" and turns his attention to the leader. He moves 30 feet east. Believe that puts him within 80 feet, with a BA for cunning action dash. He aims his light crossbow and fires. (Rolled in game log)

Attack: 20 Damage: 13 Sneak attack: 2

Seeing the leader within range Gramps throws a firebolt at him

Attack: 19 Damage: 16 

((Yep, sorry the Giant's might is extra damage from Big Bolt, which gave her enough to drop the hulk.))

((60 ft from move and BA dash on a most direct route to the leader gets Keller next to Grandpa, and 95ft from the leader, so light crossbow would be at disadvantage due to range?))

Larry gets up, and sprints after Keller.

Bryn shifts to the south, unleashing another blast of cold to try to slow the leader down.

Attack: 13 Damage: 4

A handful of skitterers appear at the edge of the ruins near the platform bearing creatures, which seem to have made no move to indicate they are aware of your presence. The skitterers his and chitter as they bound through the rubble towards the party.

Keller: 21 
Grandpa: 19
Black: 19 (DEX Save, pls)   
Larry: 15 (prone)  
Brynn: 15  
Bolt: 11  
Skitterers: 8 (X,X/X/-X/-9/X)
Skitterers: 4 (?/?/?/?/?)
Hulking Figure: 2 (-103) (oops, lost track... it's a lot)
BB: 2   <-----<<
Leader: 2 (-10)

BB decides to focus on killing the leader, now that everyone is piling on.

"Aight. Bye."

Attack: 16 Damage: 7

Attack: 8 Damage: 8

The leader sneers at BB, swatting his attacks away again with its staff, before turning its back on him and striding towards the newly arrived chittering skitterers, barking orders at them and pointing at BB.

((BB may make an opportunity attack at the creature that seems to no longer have a care for his presence.))

"Wait! No! I can do better!"

Attack: 15 Damage: 14

The creature keeps walking, not even bothering to acknowledge BB's flailing. As it gets closer to its minions, its confidence seems to be growing, and it turns and looks back, extending its staff and chanting in a guttral tone. BB can see the air around the staff seem to warp, and he feels the air grow thick and violent around him.

((Make a WIS Save, BB!))

((19 in the game log))

The warping builds to a peak, BB focusing his mind to weather the attack. For a moment he feels like he is losing coherence, but manages to force himself back together, though it still hurts his mind.

((That saves, only take 8 psychic damage.))

Keller: 21    <-----<<
Grandpa: 19   <-----<<
Black: 19  <-----<<
Larry: 15   <-----<<
Brynn: 15     <-----<<
Bolt: 11     <-----<<
Skitterers: 8 (X,X/X/-X/-9/X)
Skitterers: 4 (?/?/?/?/?)
Hulking Figure: 2 (-103) (oops, lost track... it's a lot)
BB: 2
Leader: 2 (-10)

(Leader -10 doesn't seem right? as I hit him for 18 on attack of 24 in post 2569)

Seeing the skitters close together as well as the leader Gramps tries to catch them all in faerie fire again DC16 DEX save or be lid up and advantage against.

Furthermore he orders Black to dash next to BB to interfere when needed.

((Yeah, I lost track in here, but have the correct info on Roll20. Damage is getting logged! Think he's somewhere around -40 now.))

((Grandpa would only be able to get the leader and 2 skitterers within the area of affect after moving his 25 ft and casting it at the far end of the spells range (and allowing for the cube to extend beyond the 60 ft range, eg originate at an edge within 60 ft). He'd be able to get the leader and 4 skitterers based on their current arrangement next turn, or could mount Black and ready the casting to go off when Black gets him closer.))

Let's use Black as my ride and go off when close enough to get as many as possible. He'll stay on till besides BB.