Vasal of the Seal vs White Dryad Nia

Overall comparison

HERO	Fraction	Element	Type	Rarity	Aura
Vasal of the Seal	Demonspawn	Force	HP	Legendary	HP 33% Place: All battles
White Dryad Nia	Sylvan Watchers	Void	Defence	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
White Dryad Nia	60	6	20145 -1170	683 -187	1277 -11	98	15	50	45 +5	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.]
White Dryad Nia	Strangling Plants Formula: 2.5*DEF Attacks all enemies. Has a 30% chance of placing a 30% [Decrease SPD] debuff for 2 turns. Decrease SPD 30%	Riotous Revival Formula: 0.4*TRG_HP Removes all debuffs from a target ally, then heals them by 40% of their MAX HP. If the target of this skill is not this Champion, decreases the cooldown of all of the target’s skills by 2 turns. Cooldown: 4	Bark Flesh Places a 50% [Ally Protection] buff on all allies except this Champion for 2 turns. Also places a 15% [Strengthen] buff on all allies for 2 turns. Cooldown: 6 Ally Protection 50% Strengthen	Broad Roots [P] Formula: 0.2DEALT_HEAL+(0.2EXCESSIVE_HEAL) Whenever this Champion is healed, heals each ally except this Champion by 20% of that heal.