So I don’t know if your magic is through bloodlines, random per person, or if it’s a learned skill but here’s some ideas

Aura ideas: Close to standard chi or life energy stuff, the magic enhances your reflexes, strength, healing and can allow you to sense others through their aura. Maybe create beams or blasts made of this energy as well.

Psychic like powers: Use one or more psychic like powers like telekinesis or telepathy and flesh them out. With telekinesis you can have the Star Wars force powers like push, crush, pull, and choking but remove the force mystical stuff. Something like telepathy you can allow them read the minds of those around them and send messages to each other and work up to something like mind control from there.

Summoning: You could have magic he you summon either people, animals, or weapons from other planes like Elder Scrolls with the planes of oblivion or have it be custom like each mage can summon a spirit or demon but it’s personal to each one and so on.