Go to the Central Bulwark and use the Blue Rock Fragment.
Step 1. Go to the Central Bulwark near the Katalam GateA gateway connecting Katalam with Danaria. and use the Blue Rock FragmentA rock glowing with blue light. Use it near the bulwark at the Katalam GateA gateway connecting Katalam with Danaria...
Step 2. Talk to OthurAn Archon Battlegroup Centurion assigned to the Katalam Foothold Battlegroup at the Katalam Gate..