A Gift from the Drudge
When you return to Ree, one of the Chosen (a Foundry Maintainer) received a "drudge gem" for you - they're psionic crystals that socket into the harness you wear; in addition to the current harness effect, it will actively increase your STR score by 2 (which will then by proxy increase the other function the harness grants).
So make a note of that in case I forget. It only works with the harness.
The Chosen tells you that it is a gift from one of the Drudge, sent up from the depths by one of their kobold followers who stated that his master wished you to have it, that you wear one of their harnesses and it believed it would prove helpful.