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It's enough to buy the third hero on the left at the very beginning of the game, and we already have +1 Fury, and with just a little more, we'll have +2 Furies. And all of this without any effort. Furies are a terrifying force against any Dungeon opponent, and increasing the growth rate of these little killers can be decisive.
If you're playing as Iran, this is a huge bonus. Don't underestimate the Pit!