Nerubian Tower / Icecrown Tower:
I use it in my Duel of Gods map as the new trait ability of the Lich.
Summon: places an Icecrown Tower at a location, after 30 seconds it will be fully summoned. The Icecrown tower attacks enemies each 2 seconds with bolts of frost that deal magic damage and causes their target to be rooted in place for 1 second, it is also able to raise skeletons to defend the lane, the skeletons can't attack heroes.
Can only have one.
Scalings:
The tower deals 10% extra damage for each 100 SP
Cooldown: 180 seconds
It is an utility ability meant to help the Lich defend the lane, super useful in Hero Siege mode.
The Tower upgrades itself overtime.