Death grip - through grounding

[Littleburst]

I believe it's this glyph:

Glyph of Resilient Grip
Minor Glyph
Classes: Death Knight
Requires Level 55
Item Level 55
Use: Permanently teaches you this glyph.

When your Death Grip ability fails because its target is immune, its cooldown is reset.
Sell Price: 1

W T F ?

That is mental.