Basically the same as the undying mages variant of Domination mode, except for the following:
The objective is to destroy the enemy v'tallia orb by raising its damage stat until it's equal to or greater than the orb's life stat. Each v'tallia orb is a conjuration and has 10 life x the number of friendly mages. V'tar points are accumulated from v'tal orbs just like v'tar orbs, but they cannot win you the game. Each player or team has a v'talia orb in a predetermined location, usually near their starting zone(s). There are also v'tal orbs spread across the arena at certain intervals with several sslaks guarding them. You cannot move into or past a zone with a v'tal orb if you have not destroyed the v'tal orb before it. So if you pass through a zone with a v'tal orb and want to move in to attack the next one instead, you won't be able to.
V'tal orbs are conjurations with 1 life, cannot be targeted by a ranged attack, and any amount of damage is enough to destroy them. When you destroy a v'tal orb every mage on your team either gains 2 mana, loses 2 damage, or gains 1 mana and loses 1 damage. Then every upkeep afterwards one mage on the team loses 1 damage or gains 1 mana.
The shape and size of the arena depends on the number of players on each side. In a five player game, you will want 3 lanes, each lane being 2-3 zones wide and about 10 zones long, excluding the team "base" area/respawning points.
What do you think?