Demeter's add Chill to abilities, improves healing, and applies various debuffs. One of favorite Boon from Demeter is Crystal Beam which transform your Bloodstones into a Crystal Beam that deal continuous damage every 0.2 sec which is pretty good. Combine with Crystal Clarity, you can easily defeat any boss.

Your Attack is stronger and inflicts Chill.
Attack Damage: +40%

Your Special is stronger and inflicts Chill.
Special Damage: +60%

Your Cast drops a crystal that fires a beam at foes for 5 sec.
Cast Damage: 50 -> 8 (every 0.2 Sec.)

Your Cast damages foes around you and inflicts Chill.
Blast Damage: 50 -> 70

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Your Dash shoots a gust ahead that inflicts Chill.
Cust Damage: 15

Your Call creates a winter vortex that grows over 5 Sec., inflicting Chill.
Vortex Damage: 10 (every 0.25 Sec.)
Max Gauge Bonus: 10 Sec. Duration

Whenever you Cast, damage foes around you and inflict Chill.
Area Damage: 40

After you take damage, damage and completely Chill your foe.
Revenge Damage: 10

Your Boons become Common, then gain Rarity every 3 Encounter(s).
Random Boons Affected: 1

Any healing effects are more potent. Restore 52 health now.
Bonus Restoration: +30%

When you have no Bloodstone, take 10% less damage and deal more.
Damage Bonus: +10%

Your Cast fires longer and inflicts Chill.
Bonus Duration: 2 Sec.

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Applying 10 stacks of Chill causes a blast, clearing the effect.
Blast Area Damage: 80

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When all foes are Chill-afflicted, they are +10% slower and decay.
Decay Damage: 20 (every 0.5 Sec.)

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Chill-afflicted foes shatter at 10% Health, inflicting Chill nearby.
Shatter Area Damage: 50

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Your Cast moves slowly, piercing foes and firing shards around it.
Shard Damage: 20

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Your Cast is stronger and tracks foes more effectively.
Beam Damage: +10%

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Your Cast blasts an area with freezing Festive Fog that inflicts Chill.
Blast Damage: +30%

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Your Jolted effects do not expire when foes attack.
Jolted Duration: 10 Sec.

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If you have no Death Defiance, your Health slowly recovers.
Life Regeneration During Battle: 1 Health (every 0.8 Sec.)

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