I see, what if it were Potterverse-related? Example, an interested player used these in a character sheet: Sectuminterna: similar to Sectumsempra except it causes internal bleeding as opposed to external cuts; developed partly on herself and with animal testing (mainly rats). Reducto Corporis: variant of Reducto spell used to blast living beings into pieces; developed by 'blowing up' test subjects (mostly cockroaches).
Should I as a GM allow it with a warning or ix-nay this entirely altogether? The reason I ask is because with Ilvermorny lore, there is a magical creature called a Hidebehind that specializes in gutting its humanoid victims. I don't go into detail with it, but I did point out it exists. So as long as the players don't go into graphic detail, is this allowable?