[Fandom-verified, not yet confirmed in official patch-note naming] Passive: conjures up to 3 Potency runes that are consumed by the next spell to enhance it. Active: briefly turns intangible and immediately conjures maximum Potency runes.
Charge-based
[Fandom-verified, not yet confirmed in official patch-note naming] Chains magic attacks; final hit can conjure a Potency rune if it hits at least one enemy.
Passive
Prepares Merlin's nature spell school for the next cast.
Short cooldown
Conjures giant brambles that collide for area damage; Potency increases damage.
Short cooldown
Calls stars down on nearby enemies; Potency increases targets and damage.
Long cooldown
Creates a defensive stone barrier that blocks incoming damage and later bursts for area damage.
Long cooldown
Prepares Merlin's arcane spell school for the next cast.
Short cooldown
Channels piercing lightning through enemies; Potency increases damage.
Long cooldown
Launches an exploding fire projectile that ignites enemies; damage scales with travel distance.
Short cooldown
Deploys a tracking frost orb that repeatedly damages and chills enemies over time.
Long cooldown
Prepares Merlin's sacred spell school for the next cast.
Short cooldown
Targets the most wounded nearby ally with regeneration; Potency increases regeneration value.
Short cooldown
Emits a light burst that stuns/staggers enemies and grants shield to nearby allies when enemies are hit.
Long cooldown
Turns Merlin intangible and teleports forward.
Short cooldown
[Fandom-verified ultimate name/mechanic] Summons a taunting standing stone that eventually explodes for heavy area damage.
Long cooldown
[Fandom-verified ultimate option under Forbidden Spells] Calls down a controllable-impact meteor that deals massive area damage.
Long cooldown
[Fandom-verified ultimate option under Forbidden Spells] Empowers upcoming attacks to fire piercing corrupted projectiles and generate Potency on hit.
Long cooldown
[Fandom-verified ultimate option under Forbidden Spells] Sacrifices Merlin's health to revive/heal allies and damage nearby enemies based on life sacrificed.
Long cooldown