I recently completed the avalanche raid on the Vaniki server, which is located in the Icefall Glacier zone with a total of 12 toons. The quest NPC did not die and I received the server-wide recognition for beating the event. Upon completion, there was no corpse for the raid mob Avalanche, nor was there a chest containing any loot.
Avalanche still drop no loot. Got server wide for killing him on Yelinak but there was no loot on his corpse and no chest.