Hela

Superhuman Strength : Hela possessed tremondous levels of Superhuman Strength as the first-born of King Odin,which is great enough to slaughter almost all the Valkyrie Warrior Maidens by herself (with only their leader surviving Hela's might),effortlessly slay every single Einhejar of Asgard,easily dominate Thor himself,and even catch Mjolnir one handed with ease before using Mystical Means to destroy the Nearly indestructable Asgardian Hammer. Even after Thor gained his full powers,Hela was still too strong for him. Only a fully empowered Surtur and Odin at full power was stronger than Hela,with Surtur destroying her by destroying Asgard and Odin defeating and imprisoning her in Hel.

Arcene Lore : Hela had encyclopedic knowledge and great skill in ultilising mystical energies and artifacts. She was capable of easily destroying Mjolnir and was one of the few able to wield it after Odin enchanted it. She easily knew that The Casket of the Ancient Winters was of no use to her,The Infinity Gauntlet in Odin's vault room were a replica and that the Tesseract could still be useful to her. She also managed to use the Eternal Flame to revive her old Army and Fenris.

Master Combatant : Hela was a terrifyingly skilled and deadly warrioress in both armed and hand to hand combat,testament to her skills was that she was the Executioner of Asgard's will and Chief of the Legions of Asgard and was capable of slaying almost all the Valkyorior Warrior Maidens,who were all Legendary Asgardian Warrioress on their own right,and easily defeating and almost killing their leader Brunhilde. Her skills are so great she easily slaughtered all the Einhejars by herself and was capable of easily defeating even Thor,who is among the greatest warriors in Asgard's history,in both their duels and still had the upper hand even after Thor was empowered. The only Character to ever defeat Hela in battle is Odin himself,who had cast her out of Asgard and imprisoned her in Hel.