The Dendro Hypostasis is one of the newest Field Bosses introduced in Genshin Impact with the release of the Sumeru region, focusing on the Dendro element. Here's a comprehensive overview.

Image via HoYoverse.
The Basics
•Appearance: The Dendro Hypostasis manifests as a crystalline structure with a central core surrounded by floating, leaf-like appendages. It exudes an aura of Dendro energy, with its form shifting and glowing with vibrant green light.
•Location: Sumeru Region: This boss can be found in the Sumeru region, specifically in the area near the Grand Bazaar in the city of Sumeru.
Combat Mechanics
•Phases: The fight with the Dendro Hypostasis involves dealing with its shifting forms and elemental abilities:
•Initial Phase: It starts with a protective shield that must be broken to damage its core directly.
•Elemental Shift: After breaking its shield, it shifts between different Dendro abilities, requiring players to adapt.
•Regeneration: At certain health thresholds, it might attempt to regenerate or shift forms, which can be interrupted for bonus damage.
Attacks
•Dendro Spheres: Summons small Dendro spheres that chase players, dealing Dendro damage on contact.
•Dendro Rings: Creates rings of Dendro energy that expand outward, creating shockwaves.
•Dendro Rain: Briefly calls down a rain of Dendro energy from above, damaging anyone caught underneath.
•Regeneration Attempt: When its health is low, it might try to regenerate by creating a protective field, which can be interrupted.
Strategy 
•Elemental Weakness: The Dendro Hypostasis is particularly weak to Hydro and Pyro, as these elements can trigger reactions like Blooming (Dendro + Hydro) or Aggravate (Dendro + Electro).
Avoiding Damage
•Utilize characters with high mobility or crowd control like Venti or Jean to avoid the Dendro spheres or manage the battlefield.
•Characters with shields like Zhongli can mitigate the damage from its Dendro attacks.
DPS Focus
•Focus on breaking its shield first, then switch to high burst damage characters like Hu Tao or Eula when it's vulnerable.
Elemental Reactions
•Triggering reactions like Burgeon (Dendro + Pyro) or Bloom (Dendro + Hydro) can deal significant area damage or create seeds that explode.
•Healing and Shielding: Given its Dendro-based attacks, having a strong healer like Bennett or someone who can apply Hydro for healing like Kokomi can be beneficial.
Team Composition
•DPS: Characters like Keqing for Electro reactions or Tighnari for Dendro can be effective.
•Supports: Characters like Xingqiu for Hydro or Fischl for Electro to set up reactions.
•Healer: Characters like Diona for healing with Cryo resonance or Barbara for Hydro application alongside healing.
•Utility: Zhongli for his universal shield or Sucrose for Elemental Mastery boost and crowd control.
Rewards
•Defeating the Dendro Hypostasis grants:
•Primogems
•Hero's Wit
•Mystic Enhancement Ore
•Talent materials like "Teachings of Admonition" or higher tiers for character ascensions related to Dendro.
Tips:
•Reaction Management: Utilize elemental reactions to deal substantial damage. Dendro's new reactions can be very powerful when combined correctly.
•Interrupting: When it tries to regenerate, focus heavy damage to prevent it from healing.
•Dodge Timing: Learn to dodge its Dendro sphere and ring attacks. The spheres have a slight delay before moving, giving you time to react.
•Environmental Awareness: Use the terrain around the battlefield to your advantage for dodging or positioning.
The Dendro Hypostasis introduces players to the complexities of Dendro reactions, making it not only a challenging but also a uniquely educational fight in Genshin Impact, teaching players about the new elemental dynamics introduced with Sumeru.