- Using the ice thorns at level 4 with emblem of might and frostroot storm skill specialization cost 1 mana at every use. The specialization emblem of might make the skill cost no mana if a two handed weapon is equipped and the other specialization make the skill cost more mana because one more spike is thrown. There seems to have a contradiction that can explain the cost of 1 mana by use.
This is a known bug, it should indeed cost 0 mana. We’ll work on a fix. Thanks!