How to Unlock Skills in Phantom Blade Zero

In Phantom Blade Zero, skills are unlocked from the "Train Abilities" menu, which opens when you interact with a bell or fast travel point. Abilities sit in three rows that must be unlocked left to right and are tied to Blackstone, Sha-Chi Amber, and Memory Flowers collectibles, so a skill requiring 4x Blackstone means gathering 16x Blackstone Fragments. The interconnected perks in the second and fourth rows also need Banyan's Hearts, of which there are eight in the game, earned from Banyan Tree encounters or bought from Quick Hand Zhang for 100,000 Remnant Dust each.