Marvel Comics (Otherworld)

Merlyn

Merlyn, a member of a race of immortal, powerful beings, was born on Earth-148. He became the student of Necrom, his world’s Sorcerer Supreme. Necrom asked Merlyn and his fellow-student Feron to help him in a magical ritual. Feron contacted the Phoenix Force on Earth-616 and using the Phoenix an alignment was created between parallel universes. This assignment was marked with a tower in the same place on every Earth in the Omniverse. This alignment created a matrix of nearly endless magical energy. Necrom desired the power of the Phoenix for himself and attacked Feron. Feron, with his Phoenix fueled magic, battled his master and Merlyn used the opportunity to jump into the Matrix, taking its power for his own. Necrom wounded the Phoenix and escaped with a part of it. The Phoenix left Feron who stayed behind on Earth-616. Merlyn travelled to Otherworld and established himself as the Omniversal Guardian, safeguarding the total of all universes in existence. With the powers of the Matrix, Merlyn dedicated himself to protecting the universe and finding Necrom. Merlyn is part of a gestalt that links himself with all of his alternate selves in the various realities in the Multiverse. Merlyn lives both ‘backwards’ and ‘sideways’ in time.

Physicals

Holds onto a dangling Captain Britain despite demons hanging off his feet (source) (Hulk Comic #28)
Gets blasted by Mordred (source) (Hulk Comic #29)
Powers through as stones are launched at him (source) (Marvel Preview #22)
Lifts Lilith by her throat (source) (Nick Fury’s Howling Commandos #4)
Survived Morgan Le Fey launching burning rocks at him (source) (Mystic Arcana Black Knight)
One-shots Longshot (source) (X-Men: Die by the Sword #1)
Gets beaten down by Diana Fox (source) (New Exiles #16)
Tears off a magical collar (source) (Infinity Countdown: Black Widow)

Magic - Offensive Magic

Fires lasers out of his hands (source) (Captain Britain #36)
Takes the fire off his flaming robe and throws it at Mordred (source) (Hulk Comic #28)
Burns Captain Britain with blistering flame (source) (Daredevils #1)
Readies an energy blast (source) (Excalibur #50)
As a ghost he blows away several demons (source) (Paradise X #12)
Casually burns Lilith Queen of vampires to death (source) (Nick Fury’s Howling Commandos #4)
Drives away some dragons (source) (New Excalibur #11)
Blasts a dragon (source) (New Excalibur #12)
Blinds some guards with a wave of his hand (source) (Mystic Arcana Black Knight)
Hurled shooting stars at Morgan Le Fey (source) (Mystic Arcana Black Knight)
Absorbs his daughters magic (source) (X-Men: Die by the Sword #5)
Banishes Melanicus back to its relm (source) (Doctor Who #19)
Blasts a demon (source) (Black Knight #1)
Defeats his apprentice Bohra with a single shock of electricity (source) (Doctor Strange and the Sorcerers Supreme #1)
Breaks a magic resistant barrier by channeling the power of several extremely powerful magicians and firing it (source) (Doctor Strange and the Sorcerers Supreme #17)

Magic - Defensive Magic

Uses a force field to block Mordred’s fire (source) (Hulk Comic #28)
Blocks a blast from Morgana (source) (Iron Man #150)
Creates a force field around an entire castle (source) (King Arthur and the Knights of Justice #1)
James Jaspers can’t kill him (source) (X-Men: Die by the Sword #1)

Magic - Teleportation

Teleports a boy away before he could be eaten by a dragon (source) (Young Allies #11)
Teleports out of a theater (source) (Tales of Suspense #27)
Teleports Captain Britain his staff back to him (source) (Captain Britain #34)
Teleports away (source) (Excalibur #50)
Disappears in a puff of smoke (source) (Nick Fury’s Howling Commandos #6)
Vanishes with some green energy (source) (New Excalibur #12)
Teleports into Percy’s room (source) (Mystic Arcana Black Knight)
Uses the space stone to teleport Natasha from London to New York even though she could only use it to teleport to places in her line of sight (source) (Infinity Countdown: Black Widow)

Magic - Shapeshifting

Makes himself look like an old salesman (source) (Strange Tales #71)
Makes himself look like an old man (source) (Tales of Suspense #27)
Disguises himself as Beliar so convincingly he fooled an equally powerful wizard (source) (Marvel Preview #22)
Shifts between different forms (source) (Daredevils #1)
Shifts between his previous forms (source) (Excalibur #50)
Makes himself look like a short old man (source) (Excalibur #125)
Turns himself into a crow (source) (Mystic Arcana Black Knight)

Magic - Illusions and projections

Creates an image of himself to a boy as a face in a small cloud to communicate to him (source) (Young Allies #11)
Appears to Captain Britain as a giant figure (source) (Captain Britain #1)
Projects what’s going on back on earth to Captain Britain (source) (Captain Britain #34)
Appears as a face in the sky for the black knight (source) (Hulk Comic #23)
Speaks to a football team through Excalibur (source) (King Arthur and the Knights of Justice #1)
Creates a fake him to trick Lilith (source) (Nick Fury’s Howling Commandos #6)
Shows Percy images of Arthur Mordred and Morgan Le Fey (source) (Mystic Arcana Black Knight)

Magic - Telekinesis/Levitation

Hurls Captain Britain through space at a speed faster than thought (source) (Captain Britain #34)
Raises Captain Britain out of the stream of the Netherworld (source) (Hulk Comic #28)
Sends The Black Knights sword flying to him (source) (Hulk Comic #28)
Lifts Captain Britain (source) (Hulk Comic #29)
Hovers over the round table (source) (Captain Britain #35)
Manipulates gallons of blood (source) (Mystic Arcana Black Knight)
Levitates above Doctor Strange (source) (Doctor Strange and the Sorcerers Supreme #1)
Manipulates the controls of the Tardis to come to his aid (source) (Doctor Who #14)

Magic - Time Manipulation

Sends a man back to the present (source) (Strange Tales #71)
Sends a football team back to the time of the round table (source) (King Arthur and the Knights of Justice #1)
Shows someone images of the future (source) (New Excalibur #12)
Shows the Black Knight visions of the future (source) (Mystic Arcana Black Knight)
Kills Ali with the knife Longshot threw a few seconds in the future (source) (X-Men: Die by the Sword #1)
Takes Doctor Strange back in time (source) (Doctor Strange and the Sorcerers Supreme #1)
Implies he can slow down time to at least a thousand percent (source) (Infinity Countdown: Black Widow)

Magic - Conjuring

Creates a bird out of smoke (source) (Marvel Preview #22)
Summons and then banishes several unknown eldritch horrors (source) (Marvel Preview #22)
Creates some suits of armor and weapons for a football team (source) (King Arthur and the Knights of Justice #1)
Instantly grows an entire field of Formosan Herb (source) (New Excalibur #12)

Magic - Healing/Rejuvenation

Gives the Black Knight a burst of energy (source) (Hulk Comic #23)
Using his magic touch he brings Captain Britain back to health (source) (Hulk Comic #30)
Replenishes Captain Britain’s strength with a tap of the shoulder (source) (Hulk Comic #44)
Heals a wounded stranger (source) (Marvel Preview #22)
Raises an army of fantasy creatures (source) (Nick Fury’s Howling Commandos #2)
Reconstructed Captain Britain’s body after he died (source) (Universe X #2)
Cures Natasha of the sixth dimensional venom running through her veins (source) (Infinity Countdown: Black Widow)

Magic - Magical senses

Senses the death of one of their scouts (source) (New Excalibur #11)
Senses when Morgan Le Fay and Dr Doom summon Excalibur (source) (Iron Man: Legacy of Doom #3)
Senses when the Black Knight is fighting Troll (source) (Thunderbolts #169)
Senses when people break into his tower (source) (Thunderbolts #169)

Magic - Mental Stuff

Looks into Captain Britain’s mind (source) (Hulk Comic #42)
Makes the world think that a monster attack was just a natural disaster and wipes Iron Mans and Dooms memories (source) (Iron Man: Legacy of Doom #3)
Appears to Tony as a mental projection (source) (Iron Man: Legacy of Doom #3)
Talks to Faiza through her mind to get her to take Excalibur (source) (Captain Britain and MI-13 #4)
Mentally tortures Sage (source) (New Exiles #16)
Read Damian Hellstrom’s and Lilith’s minds to know that there betraying humanity (source) (Nick Fury’s Howling Commandos #4)

Magic - Transformation

Transforms Captain Britain’s quarter staff into the Star Scepter (source) (Captain Britain #36)
Turns his wooden staff into an elegant wand (source) (Hulk Comic #28)

Magic - Other

Teaches someone how to lift people with his mind, grow giant sized, walk trough walls and to vanish(though not how to come back) (source) (Tales of Suspense #27)
Sends his Astral self into space to save Captain Britain’s soul from death (source) (Hulk Comic #28)
Easily defeated a mutant pretending to be him by sealing him in a magic crypt for thousands of years (source) (Incredible Hulk #210)
Creates a large magical hand (source) (Captain Britain #34)
Sends a tendril of smoke towards a fortress (source) (Black Knight #2)
Hurls Captain Britain through a plane beyond Time, Space, Life and Death (source) (Daredevils #1)
Drag a Lilith into a mirror (source) (Nick Fury’s Howling Commandos #4)
Turns Satana’s own sleeping gas against her (source) (Thunderbolts #170)

Magic - Magical Artifacts - Crystal Ball

Tells him which Knight is secretly evil (source) (Black Knight #3)
Shows him that the Black Knight is in trouble (source) (Black Knight #4)
Tells Merlin about some future danger (source) (Black Knight #5)
Tells him Camelot is doomed (source) (Mystic Arcana Black Knight)
Shows him when the Black Knight is going to be assassinated (source) (Mystic Arcana Black Knight)
Tells him that the Thunderbolts are from the future (source) (Thunderbolts #170)

Magic - Magical Artifacts - Diary

Just by opening it a man is teleported to the past (source) (Strange Tales #71)

Magic - Magical Artifacts - Captain Britain’s Quarterstaff

Absorbs Reavers blast sending it back to him (source) (Captain Britain #2)
Creates a shield (source) (Hulk Comic #28)

Magic - Magical Artifacts - The Star Scepter

Grants the user the power of flight for 15 minutes at a time (source) (Captain Britain #36)
Creates walls of energy (source) (Captain Britain #36)

Magic - Magical Artifacts - Amulet of Right

Turns Brian Braddock into Captain Britain (source) (Captain Britain #2)
Turns Brian into Captain Britain whenever it’s touched (source) (Captain Britain #2)

Magic - Magical Artifacts - The Black Knights Ebony Blade

Black Knight RT (source)

Magic - Magical Artifacts - Arthur’s Shield

Summons the Dragon of Justice (source) (King Arthur and the Knights of Justice #1)

Magic - Magical Artifacts - Powders and Potions

Uses a powder to create a thick mist and heals the Black Knight with a potion (source) (Black Knight #3)
Uses enchanted dust to trap Morgan Le Fay to a castle (source) (Iron Man #209)

Other

Stated to be the wisest of the magicians (source) (Black Knight #1)
He mastered the energy matrix and established otherworld (source) (Excalibur #50)
He is one of the keystones of the multiverse able to change possible futures like a dam changes the flow of a river (source) (What If? #35)
It’s said that if he got corrupted by the Ebony Blade nothing on the face of the earth could stop him (source) (New Excalibur #12)
Treats Daimon Hellstrom like the little bitch he is (source) (Nick Fury’s Howling Commandos #4)