Each point of attunement grants 2 mana and improves skills that rely on the innate magic inside you and your surroundings

Each point of Apathy grants 2% increased Mana Regeneration and 0.2% of Current Health Lost when you Directly Use a Skill, instead of adding Mana. Apathy counts as Attunement for skills and nodes that gain bonuses based on your Attunement, and for conditional effects with an Attunement requirement.