Mobile Mage Tower (MMT)

A large behemoth of a chariot containing state of the art magical canons. Magical attacks produced within can range accross great distance, and the Tower can relocate itself in a short time when spotted.
Equipped with barriers against magic and quartered by elite soldiers, the MMT is a fortified yet mobile sniper-nest that can punish enemies without hope of retaliation. The mages occupying the long-range stations are free to aim at any target, and the contraption does the rest, only requiring an expense in mana, and the skill of its user.