Hmmm Stats say he's a carry, yet the abilities make me think he's support? Fix the stats so that if he's an agility hero, who is melee, he has a little more HP.
#1. Reduce the slows' strength. Also, scale the mana cost! 90 mana for such strong slows is way too strong.
#2. You didn't list the AoE of the targeted area.
#3. Remove the silence effect, tell us the AoE.
#4. AoE is quite small, maybe keep it at that for right now, but make it so if you level spell 3 the AoE increases by like 25 per level so that once spell 3 is level 4, your ultimate's AoE is 350.