Same problem. The animation plays, the SP is spent, but the skill does no damage and the map server returns an error. This time the error is different though: [Warning] skill_castend_nodamage_id: Unknown skill used: 5. The only way I can get it to work is by making it a Single Target skill that splashes to nearby targets (sort of like Crimson Rock), but that's really not what I wanted.
EDIT: I solved the problem. Had to go into skill.c and copy the parameters of a skill similar to what I wanted to make (RK_WINDCUTTER).
