it is an AoE attack, just like gunblade skill or blade of the ruined king, activating the active doesnt turn to 100% of the amage to aoe, its just another attack.
Cool story tell again
The damage deals in an AoE, 100% of your AD decaying down to 60% of your AD.
Shut up, Wesley, go drop out of starfleet and go dimension hopping with your three fingered gaylien homebro.
when you activate the hydra, it does an skill like riven W, same area of aoe, it doesnt activate to deal 100% of your attack damage as aoe in every autoattack.
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