My lightning turrets do no damage. They used to when they were the AOE forked lightning sprite. Right now, the shot just leaves craters on the ground inside the enemies and doesn't do any damage to them.
Tested with rampant, arsenal and Creative mode after I noticed it in one of my games.

Thanks for the report.

I will add this to my todo list.

this should be back to the lightning sprite and should be dealing damage again.

I play currently 0.17 and they do no damage again. I deactivated all other mods.

This was fixed in 0.18.0, wont be fixed in 0.17.

It happened to me too, i just had to update