The Y-offset is used when the character has a super long ranged weapon, for example, a whip or a spear.
QuoteUse this option to define a vertical pixel offset for attacking spritesets for the first row
(looking down). This way it is possible to use attacking spritesets where the character's
weapon goes further down than his "feet". This option is disabled if you are not using Actor
Action Sprites (2.7.1.). Note that this option will apply to ALL of your actor attacking sprites.
And I'll be glad to help you