Idol of Huitzopochitl
The glowing figure looks up at you. You hear a voice echo in some primordial language that you can all understand as though it were your native tongue. "The troublemakers, come at last to sacrifice yourselves to me. I am unstoppable."
The spear fused to the idol's hand points at three of you in turn, firing three bright, iridescent beams at three of your number, while one of the motes orbiting its head shoots up to explode next to Drak.
Spoiler
One at Sleth...
Lance of Light attack (1d20+14)[26] for (6d8)[29] radiant damage
One at Umara...
Lance of Light attack (1d20+14)[17] for (6d8)[25] radiant damage
One at The Serpent...
Lance of Light attack (1d20+14)[27] for (6d8)[19] radiant damage
Crown of Stars at Drak
Ranged spell attack, (1d20+14)[18] for (4d12)[31] radiant damage
"Be surrounded by my glory, the rainbow god of war."
A shimmering, multicolored sphere of light englobes all 5 of you, cutting off your view of the rest of the world. It's extremely bright and seems to be all colors at once. Those who can still see recognize the characteristics of a Prismatic Sphere.
Spoiler
You are all surrounded by a 25' diameter Prismatic Sphere. Everyone needs to make a DC 22 Constitution save or be blinded for 1 minute.
Should you choose to try to pass through the sphere, make saving throws as appropriate in your post. DC22 for all of them.
The Ahuitzotl far below spend their turn moving.
=> Umara's Turn, then Vasily
Spoiler: map
1 square = 5'
No good way to show the prismatic sphere on the map, but it's 25' in diameter and centered on the Serpent, who's at the middle of the party.
VA=Vasily
SL=Sleth
SE=Serpent
DR=Drak
UM=Umara
A1-4 = Sun Acolyte
C1-8 = Champion (lance & javelin melee mundanes)
P2-3 = Senior Priests
HP = High Priest
W1 = War Priest, a more martial priest
H1-H2 = Ahuitzotl