Ice Queen (White Haze) is a Secret-rarity unit in Universal Tower Defense Z that arrived with Update 4.0, and its whole kit is built around the Freeze status ailment. She is a stylized take on Rukia from Bleach, and her damage swings higher depending on whether the enemy she hits is already frozen. Getting her is not a direct summon, though. You pull her earliest form, then evolve twice.
Quick answer: Summon Ruka (Legendary, 0.25% odds) from the Selection Banner, evolve her into Ice Queen, then evolve Ice Queen into Ice Queen (White Haze) using the fragment sets listed below.
Where Ice Queen (White Haze) comes from
The starting point is a Legendary unit called Ruka, pulled from the Selection Banner. As a summonable Legendary, her exact drop rate sits at 0.25%, so expect to burn through a stack of summons before she shows up. Once Ruka is in your inventory, the rest is a materials grind rather than another gamble.
Ruka evolves once into Ice Queen, and Ice Queen evolves again into the final Secret-rarity form. Both steps need their own fragment sets, so gather everything before you commit.
Evolution materials for both stages
| Evolution step | Required materials |
|---|---|
| Ruka → Ice Queen | 10x Frozen Fragments, 3x Universal Fragments, 4x Ocean Fragments |
| Ice Queen → Ice Queen (White Haze) | 6x Phantom Fragments, 4x Universal Fragments, 12x Ocean Fragments, 1x Frozen Blade |
Ocean Fragments and Universal Fragments carry across both steps, so bank extras while you farm the first evolution. The final step is the tighter gate because it also asks for a Frozen Blade on top of the Phantom Fragments.
Ability breakdown
Ice Queen (White Haze) runs three abilities that stack cold effects, then cash them in for extra damage. The first two are always active, and the third unlocks at her final upgrade level.
Flash Freeze (passive)
- Summons an Ice Spike on attack for 50% damage, on a 15-second cooldown.
- While Ice Spike is on cooldown, she freezes the attacked area and applies a 30% Slow debuff to enemies in it.
- For every three seconds an enemy spends in the frozen area, she has a 25% chance to apply Confusion for three seconds.
Cold as Ice
- Applies Freeze for four seconds.
- If the target is already frozen, she deals 30% increased damage, then removes the Freeze to land another 40% damage hit.
Ice Release (active, final upgrade)
- Activating it puts her into Ice Release form.
- In this form she gains 275% Damage and 30% SPA.
- Each attack in the form adds 5% SPA and 10% Temperature.
- Every second, all enemies in range take 4% Damage for each 10% Temperature she holds.
- At max Temperature she reverts to base form and is stunned for 10 seconds.
Note: the Ice Release form is a burst window, not a set-and-forget state. The 10-second stun on max Temperature is the trade-off, so time the activation for dense waves or a boss window rather than triggering it on cooldown.
Best traits for Ice Queen (White Haze)
Her damage leans heavily on stacked cold effects and damage-over-time, so traits that push raw output pay off most. The three worth chasing are Ruler, Astral, and Fission. Between the Freeze-conditional bonus damage and the Temperature scaling in Ice Release form, those traits amplify the parts of her kit that already do the heavy lifting.
You will know the build has landed when Cold as Ice starts consuming Freeze for the extra 40% hit on already-frozen targets, and when Ice Release ticks scale up as her Temperature climbs. If those bonuses feel weak, check that the target was frozen first, since the damage boost only fires against enemies already carrying the Freeze status.
