On Selo server the "meandering mulch" and "a deathspore decomposer" seem to be spawning out of era pets. They summon multiple level 115 pets. It appears all of the mobs do this 100% of the time. It makes working on some of the quests and tasks in that area almost impossible.
Confirmed. They are casting Chattering Bones XXII - spell 12721 Spell ID 12721 was used for something called Decompose in June 2007 and attached to some NPCs in Hills of Shade, which makes sense for the sporali. In late June 2007 it was changed to an AA spell. Over the years it's been used as various AA spells. In 2019 it was repurposed as a skeletal swarm AA spell. Unfortunately it's been attached to these NPCs the entire time. Thanks for letting us know!