On this page of the Assassin's Creed Valhalla tutorial you will find a description of the duel with a boss named Modron. You will learn when it comes to confrontation with Modron what type of attacks you may expect from him; you'll learn how to avoid them and how to defeat him quickly and efficiently.
The duel with Modron takes place while completing the main story mission, The Gutted Lamb. Eivor went to Glowecestre to form an alliance with the local ealdorman. Immediately after arrival at the location, he was framed for the alleged murder of Tewdwer (the future ealdorman). Still, he managed to solve this puzzle and clear himself of the charges. Modron, the local healer, led the conspiracy, and it is with her that you will have to fight.
Modron is a very agile opponent who has mastered the use of the bow. She will move amidst the wooden platforms, and she'll send towards you well-aimed arrows. If you have developed your character into distant fighting skills, you will easily deal with this opponent using the Focus of the Nornirskill combined with the use of your own bow and arrows.
Modron has two vulnerable points: left foot and back. When you hit any of those, she will be stunned. The chance of hitting her in the back occurs when Modron tries to jump or run to the next platform or slide down the rope into the arena.
When your opponent is stunned, you will have a chance to launch a powerful attack that will immediately drain her health bar by about one quarter.
A yellow flash of runes indicates the vast majority of additional Modron's attacks - these can be blocked or warded off. Make sure to avoid attacks that are signalized by a red flash of runes - they must be avoided at all cost.
Modron also fights well with traditional spar weapons, and on top of that, she can set it on fire. Targeted attacks can set Eivor on fire so that he may receive fire-damage spread over time.
If you don't want Modron to often change her position and run around the arena, just stay close to her. Avoid special and fiery attacks that could burn you and launch counter-attacks; this way, you will quickly deal with this opponent.
Similar to most of the bosses that you'll have to fight in Assassin's Creed Valhalla, Modron has the ability to heal herself. When a white, runic aura appears around her, and she starts to drink from the wineskin, it means that she's started to regenerate her health. Attack her immediately to interrupt the effect of the treatment.