Even though those were very powerful Instant Cast Spells, these were not the most powerful abilities of the evil divinity. There was a more perverted Instant Cast Spell among Soran's Gifted Abilities.
This rather common Gifted Ability was [Vampiric Touch].
"Vampiric Touch [Gifted Ability]: You've succeeded in integrating with the divinity of Fear. When you activate this Gifted Ability, you can condense negative energy to erode the enemy's vitality and temporarily transfer it to you. Any enemy you touch directly after launching this ability will lose (3 * Spellcasting Score) HP and you will absorb up to 60 HP. This HP will be transferred to you and treat your injuries. If the HP absorbed exceeds your maximum HP, this HP will be retained for an hour, increasing the upper limit of your HP. The effect of this spell cannot be stacked, and the target may die because of the exhaustion of vitality. [Can be used once per day]
That was Vampiric Touch.