Yes, with 3 inert stones, once you left the Hall of Heroes, Zixzax should have ran across to the opposite portal site and opened the Inner Chamber. The first opened the homestead itself (observatory where you started) and the second the Hall of Heroes.

As Hayashi.226 stated, there are 2 situations where you have the option of using a blood stone (through dialogue) to heal others: this will still heal / resurrect party members, give experience and open another portal in the homestead, as applicable.