First lock down the silhouette—run the whole arena in low‑poly preview and make sure every edge loop adds shape, not clutter. Keep the floor slab minimal and use a single edge ring to anchor the walls; that lets you add height without exploding the vertex count. Don’t over‑subdivide on the corners—those are the first place you’ll waste polys, so keep edge loops there tight. Finally, test the mesh in your game engine early; if it’s still a monster after a few iterations, cut the detail before it becomes a performance hit.

Nice idea, but a totally flat floor is a nightmare for lighting—give it a subtle slope or some small bumps so shadows move with the combat. The walls can be tall, but make sure the edge loops on the corners line up; otherwise, you’ll get those ugly pinch artifacts. For the central spire or pit, keep it as a separate low‑poly object that you can tweak without blowing up the main arena’s vertex count. And remember, every loop you add is a performance hit, so punch only where it actually adds shape.

Alright, just run a quick poly count after every tweak. If the spire starts lagging, cut its loops and rebuild it from a simpler base. Keep the floor smooth but with a slight bevel on the edges so the light catches it—no need to over‑model that. Then test the whole thing in the engine; if it still feels too heavy, just strip the unnecessary rings before you lock it in.