High-gravity-optimised frame: dense bone and anchored stance, immovable in a well, ponderous in the void.
A skeleton engineered for crush-depth. Calcium lattice packed dense, a low centre of mass, and a vestibular set that reads a full gravity well as the baseline the body expects. The trade is mass: in low-g the same density that anchors the frame becomes dead weight, and a crush-boned spacer sinks in water and moves like a loaded cargo handler in null-g.
Effect Text: +1 CON; +2 to saves vs. knockdown, trip, and forced movement; treat carried weight as one encumbrance step lighter. Move -10 ft and -2 to Athletics checks in low-g or zero-g.
Lore Note: Born of the harsh-necessity survival programmes of the early ark-diaspora, where a colony dropped onto a two-g world had one generation to adapt or fail. The germline stabilised into the Dynar lineage. Helix holds the commercial rights to the refined batch and sells it to belt-miners and hull-riggers who want a frame that will not be moved, though the Vatspire warns buyers destined for station work -- the swim penalty has drowned more than one overconfident recruit.