I was thinking about adding a GM skill like earthquake but with bigger radius and power so i copied the line of it (id=347) on skillgrp,skillname-e,skillsoundgrp and changed the id to a new.i added it also to xmls but i can't see its icon when i add it to my gm. Did i forgot to add something on another file?

i thing its not onlu at skillgrp...or you dont put setting for icon...try to copy paste from other skill...

But it is copy-paste from other skill and it was copied on the 3 files mention above.

I have solved the problem some time ago. For those who want to know just use skillId smaller than 9000 cause l2j Core needed some changes on L2PcInstance.java in order for skills to appear on skills window (however skill effects was ok on buff bar if was triggered by an npc or a potion).