Behemoth is a boss you can encounter during the sub-mission 'Reunion'. It has three different 3-hit patterns, so learning the timing of each and parrying will make it easier to clear.
A pattern to watch out for is the 'Roar' pattern. If you get hit, it deals massive damage, so you need to back off quickly. In phase 2, be careful of the sand explosions that rise around the Roar pattern.
▣ Phase 1 Patterns
■ Basic 2-Hit
■ Basic 3-Hit
- It suddenly rushes at you, so remember the tell for the first hit.
■ Variant 3-Hit
- If you feel it standing on two feet, it's that pattern.
■ Variant 3-Hit Ver.2
■ Headbutt then Blink
■Roar
- The damage is huge, so quickly back away.
■ Sandstorm
- It can fire three shots instead of one.
■ Backstep
■ Charge
■ Jump Attack
- Be careful, the motion of slamming down with its arm also has a damage hitbox.
▣ Phase 2 Patterns
- Starts when its health is around 60%.
- In phase 2, a button action suddenly appears, so don't panic.
- A ground AoE that rises around the Roar pattern is added.