Kill a boss Consumables only
For this square, you need to kill a boss by using only consumable items as the source of damage. This means any item with the label 'Consumable' in the game menu, most commonly including Throwing Daggers, Kukris, Pots, and other items that are consumed upon usage.
You can select any boss to complete this square, but realistically only the first, easiest bosses in Limgrave (Beastman of Farum Azula, Soldier of Godrick) are viable in most bingo matches.
:: danger Arrows and bolts are consumables but bows and crossbows are not, so arrows and bolts do not count for this square. ::