Assimilation

This spell merges the souls of two creatures, the magic originating from the Simic Hybrid's but being bent for the use of wizards and sorcerers alike. The caster must have as much space as the creature's size, creating a sigil made from finely ground ash. Then sprinkling 500gp worth of diamond dust within, also if chosen 2 ounces of caster's blood to better the chances of the spell working. After those steps are complete and the two creatures are within 20 feet, you must speak out loud the spell. For those who know the Elvish language, will understand those words, hearing the terms of the contract. After that if successful, the two creatures will disappear, and from the sigil made up of ash will rise a strange creature of your making. If not successful, you don't know what might happen. Assimilation is very much new magic, but the side effects may be severe. (Up to the dm)

You must roll a d20 + your Arcana modifier, where you must succeed, if not, things may go wrong in multiple ways.