Try focusing on the mobs instead. Attack the Cryostar when no mobs/few mobs are left. Keep spawning SnS pools and Nekro shield. Defeated Elite Cryostar with 1 Warrior, 2 Rogues, and 1 Mage. Usage of Damage Elixirs, Damage Reduction Elixirs, and ankhs are expected.

Use this tip to defeat Elite boss in under 15 mins.

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