Instructions
Fall to the ground and destroy the wooden props upon regaining control of Geralt. Cast the Aard sign at the beam supporting the ceiling to destroy it. Move away from the structure to avoid getting squished by the falling rocks.
Move forward and watch the cutscene. After you've been introduced to the Kikimore Queen, run past the next beam you see. Turn around and cast Aard on the structure to break it. If you encounter the queen at random, stay far away from her; Geralt will die after a single blow.
Fend off the kikimore workers and warriors that attack you. Equip Geralt's silver witcher sword to hurt your enemies. Standard swords are ineffective against monsters.
Repeat the process of running past the wooden posts and destroying them with Aard two more times. If you struggle against the queen's subjects, apply Insectoid oil to your sword to increase the amount of damage you inflict.
Run through the heart of the lair and dodge the queen. Breaking the beams before reaching the central lair scares most of the kikimore away, but the queen remains. Race past the many wooden posts within the room, head toward the only exit and prepare to cast one last spell.
Turn around and cast Aard on the posts. Although the room contains many support beams, one spell will do the trick. The entire ceiling will now cave in, and you will witness the death of the Kikimore Queen.