Caleb — Mechanical Arm Modification is a Spacepedia entry unlocked at Homecoming Wings 02-10. It is the definitive in-game confirmation of the cyborg reveal. His damaged right arm was rescued and rebuilt: bone, muscle, and skin all enhanced. It can transform into high-density metal at will. The trade is sensation — he has largely lost the ability to feel pain, warmth, or softness in that arm. The rescuers who performed the modification are not named. The v3.0 launch trailer's 'Skyhaven-X02, Zero-Gravity Chamber, 23rd Neural Control Experiment' copy implies the transformation is an extension of the childhood X-02 programme rather than a new development. The Memoria 'Painful Signal' — 'To feel you, no matter what the price might be' — is the emotional landing of this reveal.