This is the game's final stage, and once started, will set the events of the game's ending in motion. A couple of items will be picked up here, but they are unmissable and don't count for collection purposes, nor do they carry over to New Game+. Simply defeat the enemies along the linear path; an Ura Warrior equipped with poison arrows is encountered here, so make sure to block any arrows that come the Kid's way to avoid their nasty effects. If you find yourself cornered, don't forget to use Secret Skills. At a dead end, step on a lift to access a new area. At the end of this area, the Kid can pick up Hop-Scotch, a Spirit that allows him to hop in place of dodging. Use it to cross some gaps, after which more enemies are encountered. Fight them off and continue along the path. The place will start to crumble, so use a Skyway at the end of the path to escape.
The Skyway launches the Kid into battle with more Ura Warriors. The only way to continue past this is to hop along small platforms until you reach another lift. Use it to reach another area, where the Kid can open gates by activating switches. Past these gates is a new weapon, the Battering Ram. Use it to defeat the Mechanical Pyths behind the Kid and to break through the gate that now blocks his path. To the left is a rocky barrier; use the Battering Ram's Secret Skill to smash through it all. Fight off the Ura to gain access to a lift that allows a transition to a new area, where more Ura must be fought. At the end of this path is the Shard, which the Kid must defeat all Ura Warriors here to get to. Continue along the path to find Zulf, who can be interacted with for a choice: take him or leave him.
Choosing to take or leave Zulf has no effect on the game aside from some extra scenes in the game's credits. If Zulf was saved, the credits will show his life after the game's events, and if not, he will be absent.
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If the Kid chose to leave Zulf, he will have to defeat all Ura Warriors that attack. If the Kid chose to take Zulf, he must walk through the line of fire with no means of attack, using Health Tonics if his health gets dangerously low. In the case of the latter, the Ura will stop attacking after the Kid reaches a certain point, perhaps as a show of mercy.
Upon returning to the Bastion, the Kid will be presented with another choice, each leading to a different ending (and a separate achievement/trophy): restore (which Rucks recommends) or evacuate (which Zia recommends). The consequences of the Kid's choice will be shown during the credits. Regardless of the choice made, it is recommended that the alternate choice be made in New Game+. For now, enjoy the credits and prepare to take on any other challenges that the game has to offer, such as the Stranger's Dream, which becomes available in New Game+, and Score Attack Mode. Congratulations on surviving the Calamity and its many lasting effects!