What causes the Loghorrean's Tentacles to spawn?

People said that killing the Log’s Tentacles damages Log in some way. Only problem I had with this is I don’t know how often the tentacles will appear.
Is there a proc or ability that should hit me or is it something else?

I think it’s just a regular ability with a cooldown.

The tentacles are based on a skill with cooldown if I remember correctly.

The giants are spawned by getting hit with the chaos blobs, so moving about tends to curb the add spawning a little bit.

this tentacle talk i dont like where this is leading us :rolleyes:

Do you want to kill tentacles or kill log?
If you see a tentacle, attack it. If you don’t see a tentacle, attack log.

To the thread : I think the same way to Norzan