Land of Mist Legendary Mine: Ouroboros

This is a new feature of Land of Mist following the defeat of monsters resulting from a HARD Explore

When exploring in Land of Mist you are now given two options - Normal explore and Hard explore. If you choose Hard explore you will be given between one and three monsters (combination of Cronus Astaroth, Vargulis, Samael, ??) to defeat.

Once the land has been cleared there is a normal 24hr collect period. At the end of the 24hr collect, the land will either convert to the normal 48hr protected mode OR generate a legendary mine monster (Ouroboros)

Ouroboros
You have 168 hours to complete the battle before he flees.

Basic Information
Ouroboros has ??? Billion health. Only guild members may participate in the battle. Of these participants, only a set number can participate based on that player's level at the time of joining the battle.
 * 100 people levels 500+
 * 40 people levels 150-499
 * 20 people levels 100-149

This battle uses the Monster Stance and Piercing/Resistance systems.

Piercing/Resistance
Thanatos has Piercing, Water, Fire, Wind and Earth Resistances, and Fire and Water Weaknesses.
 * Main Body: -50 Wind Resistance, +100 Piercing Resistance

Monster Combat System
Ouroboros uses a similar monster combat system to the Astaroth/Vargulis/Samael) where players have the opportunity to gain bonuses by attacking all at once. When attacking, if a player's equipped Alliance Stance exceeds the monster's stance difficulty rating, the monster battle will receive points equal to the amount of stamina used.

Your equipped hero type determines the benefit type and the hero stance power is determined by the sum of the hero level and same type heroes in alliance with him.

Defensive alliances increase the critical stance bar which gives a flat percentage increase to the chance to get a critical hit. Offensive alliances increase the damage bar and the damage done by every attack. Balanced alliances reduce the rate at which the critical and damage bars decay. Damage added through these bars does not count towards the minimum threshold to receive rewards. A player's total damage towards loot can be observed as their Contribution total.

The Critical stance bar and Damage bar give static percentages once certain amounts are reached, as noted in the table below. When one level is filled, the next level starts from zero, and the corresponding bonus is activated for thirty minutes or until the current level goes below zero points. When the bonus expires, the bar starts from level zero. If the player's equipped stance is greater than the difficulty rating, the amount of stamina used is added to the corresponding bar. Vargulis's stance difficulty rating is 35. * Levels 2-MAX not verified

Siege Weapons
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= Lore = On summoning - no text

Ouroboros Slain
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= Rewards =

Rewards While Fighting Ouroboros
108 Attack Essence