You can contract living beings to become your familiars. Familiars gain a general boost in all areas and continue to grow and evolve at the same rate you do, gaining new abilities and powers as time passes. If you have a form of magic or other energy, they gain a new ability for whichever element they are most attuned to. You can, if you’re powerful enough, store your familiar in your soul, allowing them to bathe in your energy, increasing their rate of growth even further as well as increasing their affinity towards any energies or elements you may have access to. These familiars are extremely loyal and will never betray you.