Originally Posted by
Sakurachan5
I love the idea of giving all legendaries some nice utility to make them relevent for after their level has passed. But I agree with Blizzard, no piece of gear should last forever, even legendaries. Atiesh had a nice ability for those with it for early BC. Thunderfury and Hand of Ragnaros could have something very similar, teleporting a group to the Fireland's raid or Uldum's elemental raid. (Forgot name, possibly throne of elements)
Warglaives could transform the person into Illidan for 10 min on use if both are equiped. Shadowmourne could do the same, but transform the wielder into the Lich king for a bit, and change to frostmourne.
They would still give some relevance to that weapons that people put their time and effort into this way, without making them the permenat weapon of those who acquire it.