When the others signal their readiness, you open the door.
An enormous chamber with a twenty-foot ceiling has been carved out of the rock here. A lighted lantern rests on the floor near the center of the room. An odd array of stone monoliths—some upright standing stones, and others arranged in three-stone arches—stand around the chamber. Six low stone slabs are set against the walls around the perimeter of the room. Each holds humanoid bones, dressed in scraps of tattered cloth and rusted iron.
When you enter, a man in splintmail with a glaive peeks from behind a monolith and begins to cast a spell.
Initiative please.
If you beat Larrakh, go ahead and act.
Alyx casts Firebolt... Doing 1 point of damage.
Rolls
Initiative, Alyx - (1d20+3)
(19) + 3 = 22
Initiative, Larrakh - (1d20)
(12) = 12
Firebolt attack and damage - (1d20+5, 1d10)
1d20+5 : (15) + 5 = 20
1d10 : (1) = 1