After gathering the Runed GirdleRuned GirdleThe rune on the buckle means 'unity' or 'safety from harm.', Runed GuardRuned GuardThe rune at the base of the blade means 'to strike true' or 'truth.' and Runed Skull CapRuned Skull CapThe rune emblazoned on the crest means 'freedom' or 'for a worthy cause.' in the Red Vale, all 3 items can be brought to Renly in the Encampment, who forges the spikes, that are needed to further progress the Secrets in the Dark.
Usage
The Runed Spikes need to be brought to the Tree of Souls in the Grelwood, where the player can stab them into the 3 Runic Seals found at the roots of the tree in order to unleash the sealed powers.