This tutorial will explain how you can beat Captain Klinger in Metaphor.
For the first part of the fight, you should focus on taking out the two Mage-Soldiers, since they will buff the captain’s defense. Your Warrior should use Diagonal Slash. Your Seeker should move to the back row and use Cyc.
After the two soldiers are defeated, focus your attacks on the captain. When his health gets low, he will use Mage Flames, which will weaken your Seeker. So you should try to guard before the attack.
Otherwise, keep attacking the captain to end the fight.