Floor 15 death. I needed some regen but I couldn't find any later on.
The coal (pile of black dust) uses 1 stamina to let all items in the row be used again.
The candle makes all weapons do -1 to all status effects on all enemies.
The ring in the center is the ring of doom and gives adjacent and diagonal weapons +2 damage for this combat. It uses 1 mana.
I could only do about 500 damage a turn, a bit too low for the boss.
I also had 30 block from the structures and glove.