Rogue Spear: Black Thorn was developed by Red Storm Entertainment, published by Ubisoft, and released as a stand-alone Add-On on September 15, 2001. Black Thorn featured 9 new single-player maps, 6 new multiplayer maps, 10 new weapons, and a new multiplayer variation on the "Lone Wolf" game type in which one player takes on everyone else; the winner of the round then becomes the new "Lone Wolf".
The new weapons include:
- SIG-Sauer P228
- Steyr SPP
- Beretta M12
- FN P90 (including a suppressed version)
- Steyr TMP
- FAMAS G2
- FN FAL
- FN FNC
- SIG SSG3000
- M60E4
- IMI Galil ARM (Terrorist weapon — only available in multiplayer mode)
- Valmet M88 (Terrorist weapon — only available in multiplayer mode)