* Waterball now uses UNT_DUMMYSKILL
* Deluge/Volcano/Gale will no longer be blocked by UNT_DUMMYSKILL units
* Waterball will no longer cancel when damage is 0, on official servers this only happens if damage is negative but rAthena is no longer coded to handle negative damage unless you enable a custom feature, so... just don't use Waterball on water monsters, ok?
* Fixed two compiler warnings