shadowgaurd. wtf?

[fill want know]

i have seen some priests use that spell called shadow gaurd, where its like a shammy sheild that has those dark balls orbit around u and when somebody attacks u, they take some dmg.

where do i get this spell? i dont have it

[Peowpeow]

I think it's a racial. my troll priest has it

[prayforu]

Trolls only....