I'm reserving judgment on Temper until we confirm that it is targetable and functions as Mythic Weapon style OAT and not Joyeuse.

If it IS like Joyeuse, then SE fails hard. Still waiting for that enfeebling magic update too - it'd be nice if every NM under the sun wasn't either super resistant or outright immune the spells that would help most for that fight - like Silence, Break, Gravity etc. God forbid a RDM may actually be able to perform it's intended function.