Vasal of the Seal vs Lydia the Deathsiren

Overall comparison

HERO	Fraction	Element	Type	Rarity	Aura
Vasal of the Seal	Demonspawn	Force	HP	Legendary	HP 33% Place: All battles
Lydia the Deathsiren	Dark Elves	Void	Support	Legendary	Resist 100 Place: Arena

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
Lydia the Deathsiren	60	6	20805 -510	903 +33	1288	110 +12	15	50	40	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.]
Lydia the Deathsiren	Oppression Formula: 3.75*ATK Attacks 1 enemy. Has a 75% chance of placing a [Fear] debuff for 1 turn. Has a 75% chance of increasing the duration of any [Poison Sensitivity] debuffs by 1 turn. [Passive Effect] Attacks enemies with this Skill whenever they place a [Freeze], [Stun], [Fear], [True Fear], or [Petrification] debuff on an ally. The number of attacks increases according to how many debuffs are placed at that time; 1 attack for each [Freeze], [Stun], [Fear], [True Fear], or [Petrification] debuff placed. The first attack will target the attacker, while all extra hits will attack random enemies. Can only attack each enemy once. Fear	Siren's Wail Formula: 4*ATK Attacks all enemies. Has a 75% chance of placing a 60% [Decrease DEF] debuff and a 25% [Weaken] debuff for 2 turns. Also places a 25% [Strengthen] buff and a 30% [Increase SPD] buff on all allies for 2 turns. Cooldown: 4 Weaken 25% Decrease DEF 60% Strengthen Increase SPD 30%	Nullification Formula: 3.2ATK Formula: 3.2ATK Attacks 1 enemy 2 times. The first hit has a 75% chance of placing a 25% [Poison Sensitivity] debuff for 2 turns. The second hit has a 75% chance of placing a [Block Buffs] and [Block Active Skills] debuff for 2 turns. Cooldown: 5 Block Cooldown Skills Block Buffs Poison Sensitivity	Death Hold [P] Formula: 0.5TRG_HP Formula: 0.5MAX_STAMINA Formula: 0.5HP Formula: 0.5MAX_STAMINA Denies enemy revive attempts. This works even if this Champion is dead. If this Champion is alive when an enemy revive is denied, revives all dead allies with 50% HP and 50% Turn Meter. Grants an Extra Turn instead if there are no dead allies. If this Champion is dead when an enemy revive is denied, revives this Champion with 50% HP and 50% Turn Meter. This skill will ignore [Block Revive]. Cooldown: 9