Hello there. This mod adds a new npc called Darth Ypsilantis on Dantooine. To make sure the mod works allright,
 make sure you haven't been to Dantooine before.Although, I think it works if your savegame isn't facing the outside of the enclave(where the Ebon Hawk is).
 Anyway, there are some dlg options for you to pick : 
 3 of them put you to combat with Darth Ypsilantis 
 and 1 of 'em takes you outta the dlg : 
 ("I don't want any trouble.I'll be going.") Please make sure your character is high leveled when u fight him, cause he's really hard to beat !
 Anyway, it's difficult but worthwhile as many rewards will come by his remains !  
 Here's the download link:  
http://g.imagehost.org/download/0637/Darth_Ypsilantis_mod) 
 And here are some photoes:  
http://g.imagehost.org/0772/screenshotYPSILANTIS1.jpg)  
http://g.imagehost.org/0212/screenshotYPSILANTIS2.jpg)