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Go to the map frozen wastelands with atleast 34 curse intensity.

You can unlock all 3 achievements in one run.

Kill bosses on the runes in the order of red-blue-orange-red-purple.

You can only 1 boss on a rune per boss spawn. Trying to save one in the same set and dragging it over doesnt work.

When done all bosses have to die, a green teleport will spawn into the boss room.
Abilities are
Cave in
- an ability that fills the entire room with some safe spots
Add
- 3 adds chasing and frontal coning you
Ice beams
- 3 ice beams spawn and move in a set pattern. Dodge over them or follow in a clockwise movement
Falling stars
- i dont know what these do. No aoe was displayed, no damage was taken. Maybe it slows you slightly but didn't notice an issue.