Might that be, the symbol of tarlaks regeneration effect is wrong?
Compared to other Heroes Like Guardian Owl, the symbol from Tarlak has only one arrow up and the owl has two.
Also it can be overwritten by each other.
The special from Triton does have also only one arrow up. The same like Tarlak. And wil not be overwritten, what is right not to do.
Here two pictures, the specials has been activated in the first picture: Triton + Tarlak. Second the owl.