In Westeros, nothing can be said to be certain except death, Targaryen incest, and weird things happening around Harrenhal.

The Seven Kingdoms' most haunted castle and its de facto guardian, witch Alys Rivers (Gayle Rankin), treated Daemon (Matt Smith) to a barrage of unsettling visions in House of the Dragon Season 2. That strangeness keeps coming in House of the Dragon's Season 3 premiere, but this time, Alys finds a new target: dragonseeds Addam of Hull (Clinton Liberty), Ulf the White (Tom Bennett), and Hugh Hammer (Kieran Bew).The trio have been stationed near Harrenhal on Rhaenyra's (Emma D'Arcy) orders. They've made their camp on the edge of the Gods Eye, the largest lake in the Seven Kingdoms. After several days away from the action and unsure of their next moves, the dragonseeds are antsy. It doesn't help that Alys crashes their party with a haunted goat and a large man who appears to have antlers. We only see him for a second, but his identity is connected to the ancient history of Westeros.

The dragonseeds spot one of the Green Men of Westeros.The antlered man is one of the Green Men, a group that guards the Isle of Faces in the middle of the Gods Eye. Their order was founded 10,000 years before Aegon's conquest of Westeros, when the First Men warred with the magical Children of the Forest.