[FF] Tower Offense is a challenge in Fiend Folio, a mod for The Binding of Isaac.

Brown Nugget
Boom!
6 random Grimlin trinkets (4 smelter, 2 golden)

Note: this list does not include characters' default starting items.

The 6 Grimlin trinkets are rerolled in every room.
Golem is unable to access the Subway.

Based on the rules set in the .xml file, the following special rooms are disabled during this challenge:

The following is unlocked for completing the [FF] Tower Offense challenge: Lawn Darts

• Check out the challenge description on the mod's external Wiki.
• Download Fiend Folio from the Steam Workshop.