10,912 faces in the end.
Quad Remesh to the body to get 37,000 faces. The auto retopology kept messing up around the horns. I realized. I joined the horns too early.
Boolean to a single object.
Decimate modifier didn’t work at first. I switched to Decimate > Planar > 13 degrees. Just kept playing with it to get to 10,912 faces. It didn’t collapse but there’s a lot of geometry so I stopped at the goal which was 10,000 to 15,000. I learned stuff today.