To do damage to the Corrupt Woodsmith in Free Adira in Kena: Bridge of Spirits throw a bomb at the pillar in the middle of the arena with a connection to the Corrupt Woodsmith.

Once the pillar opens up, watch out for the wave of damage on the ground and then repeatedly do damage to the core using your bow until the Corrupt Woodsmith kneels. You can then go over to the Corrupt Woodsmith and do damage.