Onslaught! Tensions boil in the ranks of the already teetering alliance. After their stunning and brilliant defeat at the Battle of Nathema, and the war between the Galactic Republic, and Sith Empire, the alliance is torn. Troops from both sides engage in active warfare on the formerly peaceful planet of Odessen.
The Alliance Commander, returning from operations in allegiance to the [your chosen side] sees the fight with Lana and Theron. The choice of allegiance you made, on Ossus, inspires that side in the war for Odessen. With no Eternal Fleet or Gravestone to quell the resistance, the Commander fails.
The opposite side you went against on Ossus sabotages everything in Odessen. Explosions engulf the once lush, green pastures and command centers. Lana and Theron give their life to stop this and to save you, so you can continue on.. You, the commander, with the remaining forces you inspired by choosing their side, escape the inferno. You are saved by your sides reinforcements from Dromund Kaas/Coruscant.
Odessen can then become a large stronghold with your chosen sides inspired re-design. Sith Sanctums, Imperial Intelligence headquarters, Republic Temple, Smugglers Hideout, etc. Statues of Lana and Theron in memorial.