Consuming Shadows

Blizzard really needs to fix the auto-casting on this. For whatever reason, the voidwalker will just decide to not cast it every now and then. Considering this is the ~only~ ability they have at lower levels, there is no reason that they shouldn't be spamming at any and every given moment until I turn auto-cast off. This is extremely vexing, and can be the cause of many deaths.

For some reason this pierces through Anzu's self banish. Try it yourself before you down vote me; Anzu self banished at 2% and in 2 Torments my Voidwalker killed him. Very strange. I wonder if it can pierce other immunity effects?

edit: Just tested it, it also goes through Paladin's Divine Shield!

I guess this glitch is caused by that those abilities protect from attacks and spells, but not from something that is both attack and spell. So far, this is the only ability that deals damage that is both physical and magical