Philosopher's Stone
Philosopher's Stone is a click upgrade in Loot Grinder, the free medieval idle clicker.
What it does
It multiplies your loot-per-click by 2×. (Double click yield.)
Cost
It costs 15M loot and is a one-time purchase.
Why it’s useful
Click power scales with your passive income, which means this upgrade quietly gets better the longer you play — every tap lands harder as your kingdom grows.