Thornkit is a grey ShadowClan kit.
If you are the medicine cat's apprentice, Thornkit will go missing on the 5th of Leaf-bare. Thornkit can be found two screens left from the ShadowClan camp entrance. If you give him one of any type of herb, they will be healed and return to camp, rewarding you with 10 reputation. If you do not give them a herb before 1 AM, there will be a gravestone where Thornkit died. This event does not effect any other part of clan life, regardless if Thornkit dies or not.