Huitzopochitl wants to rip your heart out (IC)

[J-H]

Champions
The four surviving champions, scorched and battered, but alive, launch themselves into the air, their lances ready. The two in the north go for Vasily's Pegasus, probably seeking to knock him out of the air. The one from the east goes after Drak, who actually struck a blow. All three of these fly up, then make diving attacks.

The last one, with perhaps a clearer view, charges straight up towards Umara.

Spoiler

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They get a small to-hit and damage bonus on the first attack made after a dive, and C1-C3 have the 50' move speed to do it and still back up slightly afterward.
If the pegasus dies and any hits are left over, they'll try to kill Vasily instead. These are lance attacks, leaving them at 10' range vs their targets.
C1
Dive attack vs pegasus (1d20+8)[19] for (1d12+3)[13] plus (1d6)[4] piercing damage
Regular lance attack vs pegasus (1d20+6)[18] for (1d12+3)[13] piercing damage

C2
Dive attack vs pegasus (1d20+8)[11] for (1d12+3)[6] plus (1d6)[3] piercing damage.
Regular lance attack vs pegasus (1d20+6)[16] for (1d12+3)[6] piercing damage.

C3
Dive attack vs Drak (1d20+8)[23] for (1d12+3)[5] plus (1d6)[6] piercing damage.
Regular lance attack vs Drak (1d20+6)[9] for (1d12+3)[8] piercing damage.

C5
Regular lance attack vs Umara (1d20+6)[26] for (1d12+3)[15] piercing damage. crit +6 extra damage
Regular lance attack vs Umara (1d20+6)[13] for (1d12+3)[8] piercing damage.

Legendary Action: Leap Attack (costs 2)
The idol leaps at Sleth, grabbing at him with its free hand and attempting to slam him into the ground as it lands.

Spoiler

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Legendary action movements don't provoke OAs generally. This is a jump, attack or grab, and land movement.
Idol grapple check (1d20+15)[33] vs Sleth... raging so [roll]1d20+20[roll] and (1d20+20)[38]. Not a good choice of targets.
If he grabs you, (2d6)[6] falling damage as he brings you down and you're grappled.

Spoiler: map

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C2^20 means Champion 2 is at altitude 20' occupying the cube between 20' and 25' in height. The ^ is at the center of the square the creature's in when denoted that way.

=> The Serpent