Summary

This is a version of the wizard's tower from RadBench's Castle Panic replacement pieces, modified for a light-up feature. The body of the tower and the cap are separate, and there's an internal recess big enough to fit a 14mm sphere. Amazon and a number of craft supply stores carry tiny self-powered LEDs in that size range; search for "balloon lights." You can fit a light snugly inside the recess and put on the cap for a light streaming and/or flashing from the top of the tower. The cap is VERY thin, so resin rather than filament is recommended.