YouTD

Where I criticised the flametongue totem for being hazy, this tower is very clear in its function and understands the power of ignoring armour isn't as great as armour reduction. I don't know how powerful this amount of DPS is, but free damage is free damage.

Reducing armor is more effective the less armor the enemy has.

Ignoring armor is more effective the more armor the enemy has.

So what I said earlier remains true, this tower has a clear intended purpose. To make it more like other unique aura towers it needs just another ability to give it some flavour. Since the tower already has pure damaging power, I'd recommend it gains a utility effect.
The only thing I can think of is when a creep dies within 800 range it stuns other creeps around it for 0.1 or 0.2 seconds, maybe scaling up to 0.3. Alternatively an Earthquake style slowing effect on the ground as a spell, but I didn't want one totem to have a spell when the others didn't.