I recently completed the legendary (Tuesday) and was noticing via recount and parses that I got no Wrath of Tarecgosa procs which matched the damage of mind blast or mind flay.
So out of curiosity I spent some time today on dummy casting only 1 spell at a time and got the following:
200 Mind Blasts -- 0 Procs
200 Mind Spikes -- 0 Procs
200 Smites -- 0 Procs
Even for fairly small probabilities of a proc, one would expect at least 1 proc within these casts over 99% of the time.
VT, SWP, and DP all got a proc within only a few ticks.
So, does the legendary only proc for our DOTs and not for single target spells or is this a bug?
If this is intended, it hardly seems fair when other casters with large single target spells can have them duplicated.