This hasnt been tested but its basically a way for players to double cast in the game an AOE effect
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As a warlock, I've been able to 'exploit' the ticks of my AoE to do insane amounts of multi-target, and single target DPS. By casting another AoE right after a tick, you can basically get two ticks instantly, and do a ton of damage. Here's how it goes (time of the ticks might be off, but the time isn't very important, so much as the concept)
0.0 seconds: Cast Devouring Shadows, instant tick
1.0 seconds: Second tick
2.0 seconds Third tick, as soon as this tick goes off you recast devouring shadows, giving you an instant fourth tick
That's about 800 damage in 2 seconds at my level, excluding crits. This, with my dots on the target, far out paces the damage of my void bolt, and honestly feels a little broken. It's mana intensive, but as a warlock, mana is never a problem.