Vasal of the Seal vs Mathias Blackflail

Overall comparison

HERO	Fraction	Element	Type	Rarity	Aura
Vasal of the Seal	Demonspawn	Force	HP	Legendary	HP 33% Place: All battles
Mathias Blackflail	The Sacred Order	Force	HP	Legendary	-

Stats comparison

HERO	LVL	STARS	HP	ATK	DEF	SPD	C.RATE	C.DMG	RESIST	ACC
Vasal of the Seal	60	6	21315	870	1288	98	15	50	40	20
Mathias Blackflail	60	6	22965 +1650	914 +44	1134 -154	100 +2	15	50	50 +10	10 -10

Skills comparison

Vasal of the Seal	Abyssal Seal Formula: 0.25*HP Attacks 1 enemy. Places a [HP Burn] debuff on the target for 2 turns if they are under a [True Fear] debuff or a [Decrease ATK] debuff. Also places a [Shield] buff on this Champion for 2 turns equal to 10% of their MAX HP. Shield HP Burn	Infernal Darkness Formula: 0.27*HP Attacks all enemies. Has a 75% chance of placing a [True Fear] debuff and a 50% [Decrease ATK] debuff for 2 turns. Cooldown: 5 True Fear Decrease ATK 50%	Daemon Possession Balances the HP of all allies. The HP levels of all allies will be brought up to the level of the ally with the highest HP. After balancing HP, grants an Extra Turn. Cooldown: 6	Legion of Doom [P] Formula: -0.2DMG_MUL Formula: 0.2DMG_MUL Receives 20% less damage from Champions from the Banner Lord, High Elf, and Sacred Order Factions. If there are 2 or more Demonspawn Champions on the team alongside this Champion, increases the C. DMG of all Demonspawn Champions on the team by 20%. [C. DMG increase only works when this Champion is alive.]
Mathias Blackflail	Darken the Sky Formula: 0.07HP Formula: 0.2DEALT_DMG Attacks 1 enemy 3 times. Each hit has a 30% chance of removing 1 random buff from the target. Each hit also heals this Champion by 20% of the damage inflicted.	Deathwhirl Formula: 0.2HP Formula: 0.2DEALT_DMG Formula: 0.2HP Formula: 0.2DEALT_DMG Attacks all enemies. Places an extra hit on enemies under no buffs. The extra hit will ignore 20% of the target’s DEF. Each hit also heals all allies by 20% of the damage inflicted. Cooldown: 4	Face the Blackflail! Places a 50% [Increase RES] buff and a 30% [Reflect Damage] buff on all allies for 2 turns. Also places a [Taunt] buff on this Champion for 2 turns. Cooldown: 6 Taunt Reflect Damage 30% Increase RES	Red Mist [P] Counterattacks with the Darken the Sky skill when hit while under a [Taunt] buff placed by this Champion.