How To Kill Hydra (Lv1-4) | Evony: The King's Return GUIDE WIKI

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1/4/2022 – Added Legendary Hydra.

The strength of the hydra, the number of troops needed to defeat, and other information about the hydra (Junior Hydra, Medium Hydra, Senior Hydra, Legendary Hydra) that will appear during the “Hydra Invasion” Event.

Use Tool to Estimate Troops to Kill

Boss Battle Simulator

A tool that calculates win/loss outcome, number of wounded, RSS balance, troop count needed for zero wounds, and turn-by-turn details based on the selected boss and troop settings.

[Major Feature Update]Boss Battle Simulator ver.2(Win/loss, Wounded count, RSS balance, Turn-by-turn breakdown)Enter your troop count & instantly see the result — win or loss, & how many wounded.You can also instantly see whether the RSS balance is positive or negative. pic.twitter.com/CWHgfpb7K0
— Evony The King’s Return Game Guide Wiki (@evonyguidewiki2) June 1, 2025

Use Tool to Estimate Troops to Kill
Basics of Monster Battles
Strength of Hydra
Number of Troops to Kill – Overview
Number of Troops to Kill – Details
- Lv1 Junior Hydra 84.9M
- Lv2 Medium Hydra 120.6M
- Lv3 Senior Hydra 198.9M
- Lv4 Legendary Hydra 328.4M
Reference – Hydra Basic Stats
- Junior hydra
- Medium hydra
- Senior hydra
- Legendary hydra
Reference – Mechanics of Monster Battle
Reference – Generals Recommendations
Boss Battle Simulator
How to Kill Boss

Basics of Monster Battles

Fight with only the highest tier of mounted troops.
Increase mounted troop attack (buff values can be roughly checked in the PvP battle report). Next, increase the number of troops. If you want to get zero wounds, there is no need to raise any other factors. (Reference: How to increase buffs, etc.)
If casualties are inevitable, the number of wounded can be halved by activating the Monarch Talent Lv6 “Mortality”. Raising mounted troop HP & mounted troop defense is also effective, but does not dramatically reduce the number of wounded.
Add debuffs.
- Not a normal debuff, but an against-monster debuff.
- Basically, you equip Yukimura Sanada (-5% defense) with a set of 4 dragon equipment (-10% attack & defense).
- If you are fighting solo, set it on the sub-city mayor as possible (they will stack).
- If you are rallying, only one of the participants needs to participate with it (it does not stack with the number of people, it only applies to one person).

For more details, please refer to this article.

Strength of Hydra

Even the weakest Junior Hydra is as strong as Kamaitachi. Senior Hydra is slightly stronger than Behemoth.

Lv1 Junior Hydra 84.9M power
- Bosses with similar strength
  - Kamaitachi, Witch 3, Warlord 3, Viking Normal 50, Viking Hard 36, Viking Icebreaker
Lv2 Medium Hydra 120.6M Power
- Bosses with similar strength
  - Fafnir, Viking Hard 46, Viking Berserker
Lv3 Senior Hydra 198.9M Power
- Bosses with Similar Strengths
  - Behemoth, Viking Hard 50
Lv4 Legendary Hydra 328.4M Power
- Bosses with Similar Strengths
  - Not applicable (stronger than Phoenix, weaker than Jormungandr)

Number of Troops to Kill – Overview

The troop types, troop levels, and number of troops needed to defeat Hydra are roughly as follows. However, note that this depends on how well each player’s buffs (generals, research, gear, etc.) are developed.

t = Tier (Troop Level)

Junior Hydra
- t12 Cavalry 500,000+ / Zero wounds at 1,000,000
Medium Hydra
- t13 Cavalry 900,000+ / Zero wounds at 1,600,000
Senior Hydra
- t13 Cavalry 1,500,000+
Legendary Hydra
- t14 Cavalry 2,600,000+

Number of Troops to Kill – Details

Details on number of troops, wounded, generals, etc. are as follows.

Lv1 Junior Hydra 84.9M

t11 Cavalry 620,000 -> wounded 21,564

Buffs – Attack:452% / Defence:320% / HP:310%
Monarch Talent “Lv6 Mortality” – Available
Main Generals – Ii Naomasa Lv26
- Specialty: All green
- Full dragon Set
- Power 2.3M
- Dragon Celtic demon
Assistant – Hannibal
- Power 600k
- No gear

t12 Cavalry 464,500 -> wounded 10,900

General – Martinus Lv30 3.1M

t12 Cavalry 501,417 -> wounded 19,854

Keep Level – k32
General – Roland Lv28 2.6M
Equipment – Dragon Equipment (except ring)
Dragon – Fafnir Lv5
Research – Academy Lv30 (with most mounted tech maxed)

t12 Cavalry 600,000 -> wounded 8,100

General – Martinus Lv30 3.1M

t12 Cavalry 999,999 -> wounded 3,676

Cavalry Attack Buff +644%
Main Generals – Roland Lv32
Assistant – Aethelflaed
Dragon gear

t12 Cavalry 1,027,500 -> wounded 0

Cavalry Attack Buff +832%
Debuff – Against monsters Attack -10%, defense -10%
Keep Level – k32
General – Martinus Lv30 3.6M
Item – Normal March Size Increase / No Attack Items

t13 Cavalry 610,000 -> wounded 4,300

General – Martinus Lv31 3.2M

t13 Cavalry 950,000 -> wounded 0

Cavalry Attack Buff – about +790%

Lv2 Medium Hydra 120.6M

t13 Cavalry 1,024,454 => Wounded 9,302

Cavalry Buff – Attack 932% / Defense 614% / HP602%
Monarch Talent “Lv6 Mortality” – Available
General – Hannibal Lv36 5.8M
- 5 Star / Cultivate +500
- Attributes – L1483 / A1471 / D1432 / P1380
- Skills – Mounted Troop Attack Against Monster Lv4 / Mounted Troop Attack Lv4 / Luck Lv4
- Specialty – None
- Dragon – Fafnir Lv8
Monarch Gear – Cavalry 3 type Lv8
Buff Item – None
Rally (= None of Subordinate City)

t13 Cavalry 1,600,000 -> wounded 0

Cavalry Attack Buff – about +1,000%
Debuff – Dragon equipment set available (in rally)
General – Martinus
Skill – Against Monsters Mounted Troop Attack Lv4 available
Research – Cavalry Attack maxed out
Item – +20% Attack Buff
Monarch Talent – Lv6 Mortality

Lv3 Senior Hydra 198.9M

t13 Cavalry 1,546,000 -> wounded 16,602

Cavalry Attack Buff – about +800%
General – Martinus Lv35 5M
Monarch Gear – 3 Cavalry Types Lv8

t14 Cavalry 1,664,000 -> wounded 0

Cavalry Attack Buff – 1,300%
General – Martinus
Skill – Mounted Troop Attack Against Monster Lv4 etc
Buff Item – Attack +20%, Defense +20%, HP +20% used

t14 Cavalry 2,229,703 -> wounded 14,182

General – Aethelflaed Lv35 4.9M

Lv4 Legendary Hydra 328.4M

t14 Cavalry 2,685,402 -> wounded 21,275

Cavalry Attack Buff – about 1,150%
General – Martinus Lv38 5.8M
- Attributes – 1,441 to 1,563
- Equipment – Ares Spear / Courageous Ares Armor / Fearless Ares Boots / Fearless Ares Helmet / Fearless Ares Leg Armor / Fearless Ares Ring / All 5 Stars
- Skill – Mounted Troop HP Lv4 / Mounted Troop Defence Lv4 / Mounted Troop Speed Lv4
- Specialty – All 4 Maxed out
- Dragon – Fafnir Lv10
Subordinate City – None

Reference – Hydra Basic Stats

Junior hydra

Level – 1
Power – 84.9M
Stamina Cost – 20
Monarch EXP – 3,500
General EXP – 3,500 (Initial value without EXP increase buff)
Prestige – 50
Alliance Points – 50
Alliance Honor – 50

Drop Item (Detail)
- Junior Hydra Chest
- Refining Stone
- 5K Spiritual Beast EXP
- Artwork Fragment Chest V

Alliance Boss Package (Detail)
- Senior Alliance Boss Package

Medium hydra

Level – 2
Power – 120.6M
Stamina Cost – 30
Monarch EXP – 3,500
General EXP – 4,000 (Initial value without EXP increase buff)
Prestige – 50
Alliance Points – 50
Alliance Honor – 50

Drop Item (Detail)
- Medium Hydra Chest
- Refining Stone
- 5K Spiritual Beast EXP
- Artwork Fragment Chest V

Alliance Boss Package (Detail)
- Senior Alliance Boss Package

Senior hydra

Level – 3
Power – 198.9M
Stamina Cost – 30
Monarch EXP – 3,500
General EXP – 4,500 (Initial value without EXP increase buff)
Prestige – 50
Alliance Points – 50
Alliance Honor – 50

Drop Item (Detail)
- Senior Hydra Chest
- Refining Stone
- 5K Spiritual Beast EXP
- Artwork Fragment Chest V

Alliance Boss Package (Detail)
- Senior Alliance Boss Package

Legendary hydra

Level – 4
Power – 328.4M
Stamina Cost – 45
Monarch EXP – 3,500
General EXP – 5,000 (Initial value without EXP increase buff)
Prestige – 50
Alliance Points – 50
Alliance Honor – 50

Drop Item (Detail)
- Legendary Hydra Chest
- Refining Stone
- 5K Spiritual Beast EXP
- Artwork Fragment Chest V
- Treasure Box

Alliance Boss Package (Detail)
- Senior Alliance Boss Package

Reference – Mechanics of Monster Battle

Battle Mechanics (Monster, Boss)

In monster warfare, what is going on internally and how? Once we know that, we know what to watch out for. I have conducted many tests and analyzed the mechanics of combat.