All the orcs chant in a call and response then each orc pulls a “straw” from the shamans hand the one who draws the short straw is sacrificed as part of the ritual.
We know that you can help us.
(the crowd answers) Burn burn tear the sky asunder
But we know you extract a heavy roll
(the crowd answers) Burn burn tear the sky asunder
We pay this toll so gladly
Each orc comes forward and takes a drum sick and either goes back and begins pounding out a rhythmic beat or stays arms held high ready to die. Once everyone has a drumsick the one who was chosen has his throat cut and the portal opens