Saqsaywaman

One of the eighteen Astral Bridges, and Senjo's guardian post — the citadel's massive polygonal blocks interlock without mortar, each stone cut to fit its neighbors so precisely that the whole zigzag wall grounds Neterios's signal without a single seam to leak it.

In the game — the Interlocking Wall task: a section of the wall has been pried apart, the blocks scattered out of order. Match each massive stone back to the one neighbor it was cut to fit before the gap in the wall bleeds the connection dry. Completing it adds Senjo to your portfolio and unlocks permanent fast travel to Sacsayhuaman.