Rarefaction Cell

The Rarefaction Cell, or Power Cell is a key item in Rivulet's campaign which temporarily distorts gravity when used. Being heavier than any other item the Cell cannot be swallowed and weighs the player down slightly when held, resulting in a slightly lower jump height, swim speed, and a gradual downwards slide when on poles or in tunnels while no inputs are entered.

Use
The player can press and hold Shift to activate the Cell, distorting gravity for ~15 seconds and allowing for dramatically increased jump heights and swimming speed.

Bringing the Rarefaction Cell from Five Pebbles (Linear Systems Array) to Submerged Superstructure is necessary for achieving the Old Friend ending. For this reason it appears on the minimap.