When it works it looks so beautiful, but Echos with full army cuases some kind of collision bug, only 1 or 2 wraiths actually summon, when it starts happening there is no cure other than to remove the skill and add it back. The wraiths auto summoned by echo need to be a bit farther spaced IMO.
I can generate the same error by quick summoning wraiths on the same spot manually as well. Def a collision bug.