The hard of Sibun, the relic I found in Brigand Hall Caverns, was in fact stolen from an ancient Warsworn vault. Tine has asked me to investigate the Heart's theft, beginning at Helmgard Keep with Castellan Grian Shane. Helmgard lies on the Plains of Erathell, in Tala-Rane.
It was Pledgeshield Livia Fenan who copied the key to the Ancient Vault for the Fahrlangi mages. If she cooperates, we may yet learn the identiy of these mages and what they are trying to accomplish.