Arjuna Alter. Straight up powercreeps basically every Buster AOE except the select few with 50% charge and those 30% chargers with strong special attack niche (mainly Gilgamesh).
DW has released powerful servants before, Merlin, Skadi et c, but despite their gamechanging strengths they don’t fundamentally replace existing characters for the exact niche.
Arjuna Alter is a different ball game, since damage-dealers just need to do damage mostly, if you release a unit that straight up outnukes almost everyone else and even gives charge on top of that that unit is going to put a great deal of damage-dealers out of job.
It really needs to be emphasised just how bullshit his damage potential is. With his special attack steroid, which is basically universal barring enemies with debuff immunity (even more universal than Gilgamesh’s NP), he gets 1.5x1.32x1.3=283% buff on his NP, when most damage-dealer’s self-buffs fall between 150%-200% DW decides to give a damn Berserker almost 1.5 tmes that amount of self-buffs…WTF DW?
He doesn’t just powercreep AOE servants, low self-buff ST servants are in his strike zone too. Kintoki’s ST NP only hits 28.4% harder than Arjuna Alter’s AOE NP, but Ajuna Alter will catch up with his disgusting card damage via special attack.
In fact, let’s just put in actual numbers here. Both servants have 1k Fou, no CEs, and NP5 (to show their highest damage potential without CEs).
Kintoki’s NPBB hits 205245 trait-neutral effective damage.
Arjuna Alter’s NPBB hits 205744 trait-neutral effective damage.
The only thing really saving Kintoki from Arjuna Alter at this point is having 50% charge.
Arjuna Alter’s strength at this point has extended far beyond pure number-crunching or farming demonstration. He is in the first setup to 7T Prison Tower, and he doesn’t even need a single Merlin backing him to do the job (while the MUSAshi setup has double Tamamo backing her up), he also destroyed the Halloween 4 CQ in minturn without any CEs when other servants need super BG/Versus or Event Damage CE to make it happen.
Still not convinced this is powercreep? Think of it another way, before Arjuna Alter existed, no one in good faith would say someone like Raikou needs a NP interlude, and people even complained when she got a skill buff. But now if you want to give NP buff to a bunch of uninterluded Buster AOEs like Raikou’s, no one who knows the game is going to say it is unfair when Arjuna Alter looms over them all.