Vasal of the Seal vs Whisper

Overall comparison

HERO	Fraction	Element	Type	Rarity	Aura
Vasal of the Seal	Demonspawn	Force	HP	Legendary	HP 33% Place: All battles
Whisper	Knight Revenant	Void	Attack	Epic	Attack 29% Place: Dungeons

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
Whisper	60	6	16020 -5295	1443 +573	793 -495	95 -3	15	60 +10	30 -10	0 -20

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.]
Whisper	Softening Drive Formula: 4ATK Formula: 0.2DMG_MUL Attacks 1 enemy. Has a 50% chance of placing a 25% [Weaken] debuff for 2 turns. Weaken 25%	Charged Assault Formula: 3.8ATK Formula: -1 Formula: 0.2DMG_MUL Attacks 1 enemy. Places a 50% [Increase ATK] buff and a 30% [Increase C. RATE] buff on this Champion for 2 turns before attacking if the target has higher MAX HP than this Champion. Will ignore DEF if the target is under a [Weaken] debuff. Cooldown: 4 Increase ATK 50% Increase C. RATE 30%	Unyielding Flurry Formula: 2.6ATK Formula: 0.2DMG_MUL Attacks 1 enemy 2 times. Grants an Extra Turn if the target is under [Decrease DEF] and [Weaken] debuffs. Cooldown: 5	Unrelenting [P] Has a 10% chance of granting an Extra Turn whenever this Champion lands a critical hit. Increases damage inflicted on Bosses by 20%.