Here's a detailed guide on how to tackle the Electro Hypostasis, known as the "Surge" in Genshin Impact.
Image via HoYoverse.
Basics
•Location: Liyue: This boss is found at the Tianshu Mine, which is located near the east side of the map, southeast of the Teleport Waypoint near Starsnatch Cliff.
•Element: Electro: All of its attacks and defenses are centered around the Electro element.
Combat Mechanics
•Shield Phase: Starts with an Electro shield that needs to be broken. While any attack can eventually break it, using Electro characters can be slightly more efficient.
•Core Exposure: Once the shield is broken, its core becomes vulnerable, allowing you to deal direct damage.
•Regeneration: After taking enough damage or after some time, it will regenerate its shield. During this phase, it might change its pattern or summon Electro-charged spheres.
Attacks
•Electro Blasts: Shoots out several Electro projectiles in various directions. Dodge by moving or using obstacles for cover.
•Electro Orbs: Summons orbs that float around it. These orbs can chase you or explode if you get too close. They can be destroyed, but be cautious as destroying them can cause an Electro explosion.
•Electro Field: Creates an electrified field around itself. Staying in this field for too long can deal continuous Electro damage.
•Dash and Slam: Similar to other Hypostasis, it can dash towards you and slam, creating an Electro shockwave. Dodge to the side
•Mines: Occasionally, it will place mines on the ground. Stepping on these will trigger an Electro explosion. Be careful of your positioning.
Strategy 
•Electro Characters: Utilize Electro characters like Razor, Keqing, or Lisa to resonate or deal direct Electro damage for faster shield breaking.
•Elemental Reactions: Use reactions like Electro-Charged (Hydro + Electro) or Overload (Pyro + Electro) for area damage or to stagger the Hypostasis.
•Mobility: Keep moving to avoid the Electro blasts and mines. Using the terrain for cover or dodging can be beneficial.
•Shield Management: Characters with good shields like Diona or Zhongli can protect against its Electro attacks.
•DPS Rotation: Focus on dealing damage when its core is exposed. Use your strongest abilities during this phase.
Recommended Team Composition
•Electro DPS: Razor or Keqing for direct Electro damage.
•Support: Bennett for healing and attack boost, or Fischl for consistent Electro application.
•Hydro: Xingqiu or Barbara for Electro-Charged reactions.
•Flex Slot: Diona for shields and healing, or Sucrose for crowd control and elemental mastery boost.
Tips: 
•Electro Resonance: If you bring two Electro characters, you'll benefit from increased Electro damage, which can be particularly effective against this boss.
•Positioning: Stay at mid-range to avoid close-range slams but close enough to react quickly to shield breaks.
•Use Environment: The area around the Electro Hypostasis has obstacles you can use for cover. However, be cautious of getting cornered.
•Destructible Objects: Some objects in the arena can be destroyed for resources or to clear space, but be wary of accidentally triggering Electro mines.
•Energy Management: Keep an eye on your energy for bursts. Electro Hypostasis often provides a lot of particles, so characters like Razor can benefit from their burst frequently.
Rewards
•Varunada Lazurite (Sliver, Fragment, Chunk, Gemstone): Essential for ascending Electro characters like Razor, Fischl, Keqing, Beidou, and others.
•Thunderclap Fruit: A unique drop used specifically for the ascension of Electro characters.
•Artifacts: Potential drops from sets like Berserker, The Exile, Instructor, Gladiator's Finale, or Thundering Fury (the latter being particularly useful for Electro characters).
•Companionship EXP and Mora: For increasing friendship levels and general currency.
Final Thoughts
•Adaptability: If one strategy doesn't work, try another. Maybe switch to a more defensive setup or focus on reactions for damage.
•Practice: Each fight against the Electro Hypostasis can help you learn its patterns, making subsequent battles smoother.
•Co-op: If soloing is tough, consider co-op. Multiple players can distract it and combine elemental effects for easier shield breaking and damage dealing.
By understanding its mechanics, choosing the right team composition, and utilizing the environment effectively, you'll be well-prepared to tackle the Electro Hypostasis and gather the necessary materials for your Electro characters in Genshin Impact.
