4/5 Shield (without pushback) - every single mage uses this, with the same upgrades. Meaning the pushback on shield is pretty useless. The shield is used in every situation in PvP, because without it, mages are nothing.
4/5 Fireball (without DoT) - this skill is fine. I will use the DoT in 1v1 rooms against rogues. There's nothing wrong with the DoT upgrade, it's just that without it, Curse