Frostbringer vs Gravechill Killer

Overall comparison

HERO	Fraction	Element	Type	Rarity	Aura
Frostbringer	The Sacred Order	Magic	Support	Epic	Defence 33% Place: Dungeons
Gravechill Killer	Undead Hordes	Magic	Attack	Rare	-

HERO	LVL	STARS	HP	ATK	DEF	SPD	C.RATE	C.DMG	RESIST	ACC
Frostbringer	60	6	20310	870	1079	110	15	50	30	0
Gravechill Killer	60	6	13545 -6765	1233 +363	892 -187	96 -14	15	50	30	10 +10

Frostbringer	Cones of Cold Formula: 2*ATK Attacks 2 times at random. Has a 30% chance of placing a 100% [Heal Reduction] debuff for 2 turns. Heal Reduction 100%	Snow Flurry Formula: 2.2*ATK Attacks 3 times at random. Each hit has a 75% chance of placing a 60% [Decrease DEF] debuff for 2 turns. Cooldown: 4 Decrease DEF 60%	Arctic Winds Places a 30% [Increase SPD] and a 50% [Increase ATK] buff on all allies for 2 turns. Cooldown: 5 Increase ATK 50% Increase SPD 30%
Gravechill Killer	Freezing Toxin Formula: 3.9*ATK Attacks 1 enemy. Has a 40% chance of placing a 5% [Poison] debuff for 1 turn. Poison 5%	Blood Chill Formula: 6.8*ATK Attacks 1 enemy. Has a 75% chance of placing a 30% [Decrease DEF] debuff for 2 turns. Has a 75% chance of placing a 60% [Decrease DEF] debuff instead if the target is under a [Poison] debuff. Cooldown: 4 Decrease DEF 60% Decrease DEF 30%	Icy Veins Formula: 2.65*ATK Attacks 1 enemy 2 times.Each hit places a 2.5% [Poison] debuff for 2 turns. Places a 5% [Poison] debuff instead if the target is under a [Poison Sensitivity] debuff. Cooldown: 5 Poison 2.5% Poison 5%