Improvements to Lifeweaver’s healing have increased his ultimate charge rate. Increasing the ultimate cost adjusts for this, while also reverting a previous change to Tree of Life’s overhealth conversion that made the ultimate too strong in sustained healing.
Lifeweaver’s larger model made him much easier to hit than most supports. With his lower health pool, this hitbox reduction offsets that loss in survivability, while weapon swap improvements make his gameplay smoother and more responsive.