Diagon is an extra-dimensional demonic entity who tried to invade this dimension with the help of his Lucubra army during Earth's medieval era. He was banished back to his dimension when Sir George defeated him by cutting out his heart with Ascalon, a powerful weapon given to him by Azmuth nearly one thousand years ago.
Powers and Stats
Tier: At least High 5-A
Name: Diagon, Diagon the Destroyer, The Dragon, The Great One, The Knowledge Bringer, The Old One
Origin: Ben 10
Classification: Interdimensional Being
Powers and Abilities: Superhuman Physical Characteristics, Immortality (Types 1 and 3), Shapeshifting, True Flight, Mind Control, Energy Projection, Resurrection, Weather Manipulation, Power Bestowal, Regeneration (High-Low), Size Manipulation, Electricity Manipulation, Acid Manipulation, Reality Warping, Transmutation, Can move between dimensions
Speed: At least Massively FTL combat and reaction speed (Kept up with Ultimate Way Big)
Lifting Strength: At least Class Z (Overpowered Ultimate Way Big)
Striking Strength: At least Dwarf Star Class (Traded blows with Way Big)
Durability: At least Dwarf Star level (Only slightly harmed by attacks from Ultimate Way Big and George)
Standard Equipment: None.
Weaknesses: Diagon's essence is power, which makes him vulnerable to having his power (and thus himself) absorbed by another. Diagon's mind control can be blocked by protecting the head with certain metals, as well as mana. Ascalon can also protect its wielder from mind control. Despite being resistant to damage from conventional weapons, Diagon is very vulnerable to Ascalon. Diagon is bound to the rules of magic, as shown when he returned a payment from a refused bargain.