The Dryads Acorn
The Dryad Documents revealed one of the Hammer Fall Floor relics was a portion of the Dryad Home Tree that had been stolen by Summit during the time that Summit was at war with the Dryads.
The portion of the tree was a branch with a single Acorn. Gotta was aware that the Home Tree couldn’t heal itself unless all the portions of the tree were together. Sagla identified that the tree branch was of significant power and provided a large amount of Summits defense power.