Legendary Forge

The Legendary Forge is the Blacksmith's workshop, where the player can invest cells to increase the chances of higher quality Gear.

Upgrading and Gear Quality
See the main article for more information about gear level.

The legendary forge does not directly upgrade your items, but instead increases the chances of the items you find throughout runs to have a higher quality. Each tier increases the damage and affix slots of your items by a considerable amount, making the Legendary Forge a worthwhile investment. There are three improved qualities of gear that can be achieved with the Legendary Forge:

"+" Quality

 * The first tier of upgrades accessible to the player. The maximum can be reached after spending 500 Cells on the Forge. 25 cells spent on upgrading the Legendary Forge increases the chance of finding better items by 5%.

"++" Quality

 * Can only be accessed after the + level is maxed out. Makes ++ items appear more often. It makes gear much better. Requires 3000 Cells to reach its maximum. On 0 BSC, it tops out at 50%; with 1 BSC or more it maxes out at 100%.

"S" Quality

 * Can only be accessed after the ++ level is maxed out. Requires 10 thousand Cells to reach its maximum. On 2 BSC, it caps out at 25%; 50% on 3 BSC; 100% on 4+ BSC.

Access
The forge only appears twice in a run: after the Black Bridge, Insufferable Crypt or the Nest, and after the Clock Room or the Guardian's Haven.

Trivia

 * The Legendary Forge resembles a furnace and an anvil, the latter being a common platform associated with blacksmiths as they use them to shape and polish weapons.