Vizier Ovelis vs Vasal of the Seal

Overall comparison

HERO	Fraction	Element	Type	Rarity	Aura
Vizier Ovelis	Dark Elves	Force	Attack	Legendary	Attack 34% Place: Dungeons
Vasal of the Seal	Demonspawn	Force	HP	Legendary	HP 33% Place: All battles

Stats comparison

HERO	LVL	STARS	HP	ATK	DEF	SPD	C.RATE	C.DMG	RESIST	ACC
Vizier Ovelis	60	6	16350	1476	1013	101	15	63	40	0
Vasal of the Seal	60	6	21315 +4965	870 -606	1288 +275	98 -3	15	50 -13	40	20 +20

Skills comparison

Vizier Ovelis	Accursed Blades Formula: 1.3*ATK Attacks 1 enemy 3 times. Each hit has a 35% chance of increasing the duration of all debuffs by 1 turn.	Master of Misery Formula: 2.7*ATK Attacks 1 enemy 2 times. Each hit has a 50% chance of placing a [Block Buffs] debuff, a 50% [Decrease ATK] debuff, and a 100% [Heal Reduction] debuff for 2 turns. Cooldown: 4 Block Buffs Heal Reduction 100% Decrease ATK 50%	Vizier of Poisons Formula: 6.6*ATK Attacks 1 enemy. Applies a [Debuff Spread] effect, taking 2 random debuffs from the target and placing them on all enemies. Places a [Perfect Veil] buff on this Champion for 3 turns if the target is under 2 or more debuffs. Cooldown: 5 Perfect Veil	Unseen Assassin [P] Places a [Perfect Veil] buff on this Champion for 2 turns at the start of each Round. Perfect Veil
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.]