Evil Mage

The Evil Mage is the boss of The Ruins.

Behavior
The Evil Mage spawns after picking up the Rune Orb.

Strategy
It is advisable to clear out the entire stage to prevent Cultists from interfering with the fight. You can immediately attack it after it finishes its spawning animation without any danger.

After its first teleportation, you should start to wait out his attack cycles and attack it when it stands still. You can attack the Evil Mage while he is waving its arms, but do so with caution - when hit, he will counterattack by teleporting and leaving behind several Icebolts which fly out in a radial pattern. Carelessly falling into this attack can deal massive damage (each Icebolt will damage you seperately) and will likely leave you frozen and vulnerable to other attacks. Attacking the mage this way is risky but when mastered can significantly shorten the duration of the fight.

Once the Evil Mage is at half health he will start teleporting very often so you will have to move around to dodge his nova attack.

Having some elemental resistances can make this boss much easier. Resistance to ice can greatly reduce the time that you're frozen, and if maxed, provide complete immunity to all attacks except for contact damage.

Champion Variant
The champion variant has a gold coloration, and possesses a new attack. It will attack with much more frequency than normal.

Behavior
After it spawns, the Evil Mage will teleport and launch a volley of Icebolts, then casts a Nova followed by an Icebolt Ring. When the Icebolt Ring closes in on itself, the Evil Mage will stand idle for one second then teleport again to cast another Icebolt Ring.

When the boss reaches a certain threshold, it will begin behaving similarly to the normal variant but with less downtime between attacks.