Kuurth is Breaker of Stone. She has 3 Eiso available to her. One is from 2.1.4 Heroic Battle and 2 are 30 Gold each from the store. Which one are you looking for?
Edit: Did not realize this was an android question. Neither Kuurth, nor any Eiso are available on android since this version is dead.
Still posting in the wrong forum xd Might wanna try question and answers :-p