Nightshade's AA

[ripnabs]

-anyone wondered abt the aa ??
-i can't see the effect of using nightshade's aa ..
-whats the % of its failure ?
-the range of this aa
-number of allies healed.
-f.e at pvp
*3 players using nightshade,50% hp left ,, if Ns's aa activated ,it will recover the 50% lost? .