Changeling (New hero concept)

[[ToS]ImpBloody]

Untracable (W) -
To hide his steps, the changeling can become untargetable by physical attacks for a short period this means towers too. However, he takes more damage from spell damage in this state.
Level 1 - Untargatable by physical attacks for 4 seconds. take 40% extra damage from spells
Level 2 - Untargatable by physical attacks for 5 seconds. take 35% extra damage from spells
Level 3 - Untargatable by physical attacks for 6 seconds. take 30% extra damage from spells
Level 4 - Untargatable by physical attacks for 7 seconds. take 25% extra damage from spells
Mana Cost: 50/70/90/110
Cooldown: 20

So, essentially he could actually backdoor without any penalty, normally the tower hurting you gives you a reason to back off, but i suppose there is no reason to back off when it cant hit you.