You will find Chancer de Lion on the southern battlements of Skyhold. Speak with him to begin the quest ‘Way of the Champion’. To complete the quest and unlock the Way of the Champion skill tree, you will need to craft a Champion’s Standard. This can be done at a requisition table once you have the following items:
Codex Entry: Writing on Champion methods - Found near Blackwall at Skyhold stables or purchased from the merchant Willvan in Val Royeaux
3x Heraldic Symbol - Looted from 3 champions in Exalted Plains at Ghilan’nains Grove, Halin’sulahn, and Desolated Banks
10x Veridium - Found throughout Exalted Plains, Crestwood, and Emerald Graves. Also obtained from war table mission ‘Exalted Plains Resources’ by sending Josephine or Cullen
Note: You will need to complete the war table mission Specializations for the Inquisitor before you can find and speak with the trainer.