The RoM at floor 6 has no upgrades. You later encounter a +1 somewhere else and you might have reforged em together.
Goated seed, tho. I remember I only needed 1 healing pot in the whole run in the pitfall loot room Ill talk about later, and maybe I could have even not used it if I would have healed in advance with a sunroot. Earliest +1 plate is at 18, in a pitfall loot room, so you have to access it at 17. Imp (at 18) has a +2 arcana ring and he asks you golems, so don't kill any til you ask him. Uuhh, what else.. let me think... There was an alchemist toolkit somewhere in the mines... The mage quest is the elemental one and he rewards you with a magic missile or zapping wand. The zapping wand is +1. And, if someone's concerned, the mining quest us the crystal one.