Mellisande's vertigo effect goes off, encompassing the area in between the party and their opponents. Nerin casts
Bull's Strength upon himself, while Arkos shifts to his melphling form and casts a spell creating a flow of tentacles erupting forth from upon himself. A fireball is launched by Lealani, striking six of the yuan-tis (Y3, Y4, Y5, Y9, Y10, Y11), two of them (Y3 and Y4) directly.
http://invisiblecastle.com/roller/view/3906085/
A summoned swarm from Sarpot causes the closest of the Yuan-Ti to shriek as it is covered by insects bursting forth from the tree it was standing near. It takes dozens of painful bites. The Yuan-Ti struggles to maintain his balance as his knees grow weak from the poisonous critters. He takes a step forward, but stumbles and falls ill due to Mellisande's vertigo effect, and takes a further bit of biting damage from the swarming insects that cover him.
The other Yuan-Ti's surge forward, four (Y1, Y5, Y6, Y7) entering into the vertigo field created by Mellisande. The two other sentries (YS1 and YS2) are still trying to figure out what's going on, though one Yuan-Ti (Y4) is screaming at them and making hand gestures in order to bring them into the fray.
OOC: I took liberties with the Y2 yuan-ti since he was being hit by both Mellisande and Sarpot, and rolled some extra penalized saves for him to stumble around and possibly fall down. It might have been a fiat in the party's favor, but I thought it would be more realistic considering the kind of shock inflicted. The four yuan-ti's who entered the vertigo field do not have to make a save against nausea until the start of their next movement round according to the spell description, so I'll settle that next round.
Map:
https://docs.google.com/spreadsheet...hkey=CLDnwrIM&hl=en_US&authkey=CLDnwrIM#gid=0
I think I have Arkos' and Sarpot's actions already, so I just need actions for Mellisande, Lealani and Nerin. A couple of Yuan-Ti may be able to close into melee at the end of next round.
Init:
Mellisande: 16
Nerin: 15
Lealani: 14
Arkos: 10
Sarpot: 10
Yuan-Ti: 9