Shulk, like all playable characters in Xenoblade Chronicles, has two additional skill trees to unlock on top of his initial three. These trees tend to have much more potent skills in them; and require the completion of a number of sidequests and a certain progression in the story for them to be triggered. Also, each additional skill tree requires far fewer skill points (SP) than the initial three. Below is how to unlock each skill tree:
"Pessimism"
This skill tree is given to you upon the completion of "Desiree's Future". This quest can only be unlocked after:
- Affinity with Colony 9 of 4*, most of the way towards 5*.
- "Jackson's Awakening" must be completed, as must "Desiree's Watch".
The Pessimism skill tree, when active, will increase the Ether Defence of Shulk by 50.
"Bravery"
This skill tree is given to you upon the completion of either of the quests "A Young Captain's Trust" or "A Young Captain's Revival". Note only one of these quests will be avaliable, depending on the choices made earlier in the game. This quest is unlocked after:
- Affinity of Colony 9 of 4*, most of the way to 5*.
- Mechonis Core Cleared
- "A Yound Captain's Request", "A Young Captain's Suffering", "A Young Captain's Rise" and "A Young Captain's Challenge" completed.
The Bravery skill tree is probably the easiest 5th skill tree to unlock; as it does not require killing any high levelled enemies.
