No, not Tolkien. It's about this one: https://gondor.fi/

I wonder how this works, because how would gondor margin call your position if it turned out you bet on the wrong outcome?

I would hope this is well engineered: only selected markets, only 50% of the value, and I guess they do something on the lending side too (they use Morpho)

Use your Polymarket positions as collateral and borrow up to 50% of their current value. Enjoy capped interest rates and repay anytime. Available for selected markets.