M.I.L.K. Blue Metal

M.I.L.K. Blue Metals are 1-Star Faction Metals for developing and upgrading weapons and armor at Choku-Funsha.

Locations
M.I.L.K. Blue Metals do not drop from a mid-boss, so they only naturally drop from Trap Rooms and Haters.

May also be obtained at Gyaku-Funsha shops, as a reward from Quests or Lost Bags, the daily Hernia lineup, or from Uncle Prime. The Forcemen may drop this metal on Hard difficulty. You can purchase this metal for 50000 from the R-Point Exchange.

Trap Rooms on certain floors may contain Faction Metals. A Trap Room is a room containing a single Golden Chest, which, when opened, will seal the entrance to the room and spawn enemies that must be killed before the room can be unlocked again. The chest will always contain either a Faction Metal of that Area's color or one color below, or Kill Coins. The first four color tiers are Blue, Green, Black and Red. Certain Faction Metals can only naturally be found this way, as there is no Mid-Boss for certain Factions in some Areas. Certain Trap Rooms may not always appear, based on tower rotation. See this spreadsheet.

Following an update,  Haters  may now drop Golden Chests with drops like a Trap Room within that Area, making them a new source of Faction Metals.

Floors in  Bold  are connected to the main elevator.

Uses
NOTE: Tier is a level of power typically based on the number of times equipment has changed forms, not the number of stars it has.