Description: My epic boss (Senvial of the Mist) did not spawn after killing Spiritbinder Trenzar. I cannot continue my epic 1.5 until I have hailed him. Only then will I receive Senvial;s Blessing.
Senvial is supposed to spawn *during* the fight with Spiritbinder Trenzar, not after. The idea is to take the killing of Trenzar slowly (we killed his elemental adds as they spawned but this was on a TLP server in era, you don't say what server/level for yourself) until Senvial of the Mist spawns, then you kill Trenzar, then you beat down Senvial to low hps until he goes non-aggro at which point he can be hailed. You'll have to try again when the event resets in Natimbi.
This info from Allah about the mob may help if you read thru the comments https://everquest.allakhazam.com/db/npc.html?id=17136
