People are mainly expecting Black Shroud to change because Yoshi said that the Black Shroud will change :P
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all the spell animations are Ferocity II, the leaving is Blood Rite II. Probably just testing the buffs themselves, most likely they don't have finished animations for them yet.
i doubt they will give arc that much power, they are prolly just using arc weapon cause it looks weird, and the buffs are probably just a gm ability type thing
I wouldn't look into it too much as an Arcanist they are probably only using the weapon to make it stand out so people notice it and same with the buffs as that is a huge AOE range.
The whole point of this is to cause confusion