Essence of theOmni-Mage

You gain the ability to wield Omni-Magic, which is basically reality warping fueled by mana.

You gain a manapool large enough to fling around low-level spells for about half an hour if you don't already possess a larger one. This is merely an example to grasp the magnitude of power at which you start.

You can alter existence however you see fit. Be it copying classic magic, like a fireball (You don't actually cast the spell "fireball", you use your power to bring fire into existence), shooting lasers or even changing the rules of your current world, provided you possess enough mana to fuel these wishes, nothing's out of your range. Generally speaking, the bigger or harder to achieve the result would be, the more mana you.

Have to use. Some things like Shapeshifting are surprisingly easy to do while traveling through space is pretty complicated seeing how you just plop a few meter away.

You can enter overdrive. This state will keep your mana at maximum and give you a +100% bonus boost to your mana capacity as long as it's active. However, it comes at a hefty price; Your maximum mana capacity is degrading continuously. The degradation will not affect your bonus capacity, only your initial one. You will always regain your mana capacity when you burn yourself out. It will just take a long time.

Through a long time of hardships, training and clever use of your abilities you may unlock "Almighty Magic", the highest, the omnipotent form of magic.