#1. Okay...
#2. Boosting your attack range is too strong. Imo, make it like the old SC spell that makes it so enemies need to be within
#3. Not really support-like with the whole pure damage scaling nuke and what not, the slow is should be scaled less widely apart, i.e. 20 / 25 / 30 / 35%.
#4. Re-scale disarm duration to be 1.50 / 3.00 / 4.50 seconds, units that are at the very center of the vortex should recieve full duration disarm, where as units on the outskirts should recieve a lesser amount.