you get an armor core and weapon core, as well as an etheric light, so 3 end-game items, a bunch of rep, a REALLY good chance at the exotic bounty, a tiny chance at an elemental primary, and finally a shader/ship/emblem if you brought a key (which you should). oh and the normal chest rewards. thats alot more than "next to nothing" for beating Skolas just once. [and Grimoire/progress towards triumph.)