Hunters Specialties Deer Antler Mounting Kit - Hunting Easy-To-Assemble Wood Plaque Deer Mounting Kit with Red & Cream-Colored Skull Cover, Hardware Included

Looks like someone tried to burn it to get the meat off or for a “cool look”. I’d take it off of that plate. Lay it on a table with serrand wrap under it, mix up some bondo and pour it over just the top of the skull cap. Once bondo dries it’ll be hard as a rock and you can mount it back on a plate. They typically come with covers you hide the skull cap with. https://a.co/d/0gE7X5oq