Tunnel Steward vs Gravechill Killer

Overall comparison

HERO	Fraction	Element	Type	Rarity	Aura
Tunnel Steward	Dwarves	Spirit	Attack	Uncommon	-
Gravechill Killer	Undead Hordes	Magic	Attack	Rare	-

HERO	LVL	STARS	HP	ATK	DEF	SPD	C.RATE	C.DMG	RESIST	ACC
Tunnel Steward	60	6	8925	1255	903	95	15	50	30	0
Gravechill Killer	60	6	13545 +4620	1233 -22	892 -11	96 +1	15	50	30	10 +10

Tunnel Steward	Vermin Killer Formula: 3.2*ATK Attacks 1 enemy. Has a 25% chance of placing a 2.5% [Poison] debuff for 2 turns. Poison 2.5%	Intensify Formula: 5.5*ATK Attacks 1 enemy. Has a 50% chance of increasing the duration of 2 random debuffs on the target by 1 turn. Cooldown: 4	-
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%