Dark Athel vs Belletar Mage-slayer

Overall comparison

HERO	Fraction	Element	Type	Rarity	Aura
Dark Athel	Undead Hordes	Magic	Attack	Epic	Attack 20% Place: All battles
Belletar Mage-slayer	Ogryn Tribes	Void	HP	Legendary	HP 33% Place: All battles

Stats comparison

HERO	LVL	STARS	HP	ATK	DEF	SPD	C.RATE	C.DMG	RESIST	ACC
Dark Athel	60	6	13710	1465	925	100	15	57	30	0
Belletar Mage-slayer	60	6	21975 +8265	848 -617	1266 +341	108 +8	15	50 -7	50 +20	0

Skills comparison

Dark Athel	Profane Glaive Formula: 1.6*ATK Attacks 1 enemy 2 times. Has a 40% chance of placing a 60% [Decrease DEF] debuff for 2 turns. Decrease DEF 60%	Blades of Blood Formula: 3.6*ATK Attacks all enemies. Has a 50% chance of placing a 30% [Decrease SPD] debuff for 2 turns. Cooldown: 5 Decrease SPD 30%	Harvest of Despair Formula: 3.65ATK Formula: 0.5TRG_HP Attacks all enemies. Places a 30% [Increase SPD] buff on this Champion for 3 turns if this attack kills 4 or more enemies. Heals this Champion by 50% of their MAX HP if this attack kills 6 or more enemies. Grants an Extra Turn if this attack kills 10 or more enemies. Cooldown: 5 Increase SPD 30%	-
Belletar Mage-slayer	Fume Ax Formula: 0.22*HP Attacks 1 enemy. Has a 75% chance of decreasing the cooldown of a random skill of the ally with the highest Turn Meter, except this Champion, by 1 turn.	Slayer's Roar Formula: 0.22HP Formula: 0.2HP Formula: 0.2*MAX_STAMINA Attacks all enemies. Places a 50% [Increase ATK] buff and a 60% [Increase DEF] buff on all allies for 2 turns. Also heals all allies by 20% of this Champion's MAX HP and fills all allies' Turn Meters by 20%. Cooldown: 4 Increase ATK 50% Increase DEF 60%	Mercy of the Oasis Formula: 0.5TRG_HP Formula: 0.5MAX_STAMINA Revives all dead allies with 50% HP and 50% Turn Meter, then places a [Shield] buff on all revived allies for 2 turns, equal to 20% of this Champion's MAX HP. Also places a [Block Debuffs] buff on all allies for 2 turns. Cooldown: 6 Shield Block Debuffs	Critical Juncture [P] Has a 75% chance of decreasing all of an ally's skill cooldowns by 1 turn whenever they are revived. Once per turn, if an ally is killed, reduces the cooldowns of all this Champion's skills by 1 turn.