ORN Core (オーン・コア Ōn Koa?) is the final stage from Thunder Force III.
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This level takes place deep within the ORN Base, where Khaos dwells. It is a very short stage, with only a quick midboss fight right before the final boss.
| Thunder Force III / Thunder Force AC / Thunder Spirits | ||
| Characters | Jean R. Fern • Sherry M. Jupiter | |
| Ships | Fire LEO-03 "Styx" | |
| Stages | Hydra • Gorgon • Seiren • Haides • Ellis • Cerberus • ORN Base • ORN Core (TFIII) Graveyard • Ruins Inside • Original Battleship • ORN Core (TS) | |
| Bosses | Gargoyle • Twin Vulcan • King Fish • G-Lobster • Mobile Fort • Cerberus • Base Guarder • Khaos (TFIII) Roll Gunner • Defense Satellite • Khaos (TS) | |