A FAQ submitted by Anonymous
For you people curious about how to spawn Vermi.
Each varkid has a small % chance at having the ability to evolve into Vermivorous if they live long enough.
They DO NOT need to be damaged.
They DO NOT need to have other varkid around (but more varkid, more chances).
They DO NOT require the Blood of Terramorphous to spawn. (It does help.)
They DO NOT require X amount of Y types of varkids to be present in order to spawn.
If a varkid, or a group of varkid, have not evolved at all in 2-3 minutes, reset the spawn (by killing them all or moving to a different spawn).
To farm Vermi successfully you simply have to get used to the timing of evolutions and know when to cut your losses.
The best place to farm Vermivorous is in the tunnel for the mission to push the Dahl Minecart along. On the left of the tunnel, there is a door, and in that room, the varkid cannot hit you, but remain aggro'd so long as the door is OPEN.
XI Wiki



