Vasal of the Seal vs Kellan the Shrike

Overall comparison

HERO	Fraction	Element	Type	Rarity	Aura
Vasal of the Seal	Demonspawn	Force	HP	Legendary	HP 33% Place: All battles
Kellan the Shrike	Sylvan Watchers	Magic	Attack	Epic	-

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
Kellan the Shrike	60	6	13545 -7770	1443 +573	958 -330	98	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.]
Kellan the Shrike	Impale and Impede Formula: 3.4*ATK Attacks 1 enemy. Has a 30% chance of placing a 25% [Weaken] debuff for 2 turns. Weaken 25%	Huntsman's Gambit Formula: 2.8ATK Formula: 0.5MAX_STAMINA Formula: 2.8*ATK Attacks 1 enemy 2 times. The first hit has a 75% chance of decreasing the target’s Turn Meter by 50%. The second hit has a 75% chance of placing a 30% [Decrease SPD] debuff for 2 turns. Also places a [Perfect Veil] buff on this Champion for 2 turns. Cooldown: 4 Perfect Veil Decrease SPD 30%	Cry of the Shrike Formula: 3.7ATK(1+0.05*TRG_DEBUFF_COUNT) Attacks all enemies. Damage increases by 5% for each debuff on the target. Cooldown: 5	Unforseen [P] Will ignore [Shield] buffs when attacking under a [Perfect Veil] buff.