The party have discovered that each of The Element Stones has a spell within that once memorised can be replicated to activate one of the five seals on the Runic Door.
They have activated one such seal by memorising the spell glyphs of the Air Stone located at the Faunar Watchtower.
The party memorised the spell glyphs from the Death Stone in the Desecrated Iron Mine, before summoned Devils destroyed it. The party are yet to activate the Death seal on the door.
The party memorised the spell glyphs from the Earth Stone located in the Emerald Peaks, but were forced to destroy Unknown and by extension the Element Stone itself. They are yet to activate the Earth seal on the door.
The party memorised the spell glyphs from the Ice Stone located in the The Frozen Isle amidst the Hourglass Sea. Summoned Devils destroyed this stone too. The party are yet to activate the Ice seal on the door.