Thag is a massive asteroid located deep within the Algernon Reach. Thag is a few miles larger than Earth's moon but it has a very big difference. Thag has split into multiple massive shards which are barely held together only by the mass effect and magnetic fluctuations that erupt on the asteroid. Between the mile wide cracks that span the asteroid, lightning bolts and ash clouds exude while solar-flare like mass effect waves can move entire shards. Surviving on Thag is impossible but it is a popular place for duelists looking to battle to the death.