A Simic Hybrid, or Grafted, is someone who has added or replaced parts of their body through the process called Grafting. This process involves taking monster parts, abberations, or living symbiotic plants and attaching them to ones own body, or replacing body parts with them. They go through this process to gain strength and abilities from the creatures they graft.

One must fight against the remaining will within the parts grafted on too them. The more you graft or the more powerful the part is from the harder it is to resist. If you fail the monsters will takes over and you are driven mad.