Void Critters are the precursors to Void Anomolies and are found at the Sun Gate on Bloodmyst Isle.[19, 64]
They are mainly found around the lake the portal hovers over and will exit the lake in waves. They are fast moving and sometimes difficult to target. The best option is to go into the lake there are dozens under the water and they do not move until a wave of them exits the water. You can go right up to each and kill it or if you have any kind of ranged weapon simply target and shoot to gain the required number of kills.