School of Magick: Realm Magick

Realm Magick, also known as Half-Blood Magick, is a unique classification of sorcery used by Realm Walkers. It is extremely rare to be seen by mortals, as mortals are unable to utilize it without catastrophic consequences, such as their body exploding or burning quickly into ash. The only being in the mortal realm that can use it are Realm Walkers, or demi-gods. It is believed that the only way for a Realm Walker to exist is through breeding of an Athereal Lords or Archfiend with a mortal man or woman.
Fiends and Seraphs, on the other hand, are unable to produce Realm Walkers with mortals. If they manage to conceive a child, which is also rare, they are known as a halfling and are either to weak and die or are born into their mortal parent's race without the ability to use Realm Magic.
Abilities:

• Realm Walk: The ability to travel to different realms and their various planes of existence with ease and no use of a portal, including the Netherworld and the Aethereal Realm. Some Realm Walkers are better at this than others but all contain this ability.
• Astral Manipulation: The ability to manipulate the astral energy of a living being and allowing them to project their astral form on the physical plane. They can allow others to be able to use temporarily astral projection or block others from astral projecting, sending them back to their bodies if they had already projected.
• Soul Enhance: Like with necromancers and conjurers, Realm Walkers can summon and bind spirits of all kinds. But unlike them, they bind them to their own body to temporarily gain physical enhancements or learn new abilities without practice. Ex: Binding a fire spirit allows them to learn the skill of fire manipulation. Ex2: Binding the spirit of an ancient warrior grants some of the spirit's combat instincts.

Source

Realm Magick, like any other school of magick, is drawn from a deity. However, in this school's case, it is drawn from the deity they are born from, rather than a patron deity and channeled through their natural blood ties to that deity instead of using an Aetherium gem.