Twin Sea Dragon Serpent is a monster found in the Foggy LakeSlayer area. Killing 100 Twin Sea Dragon Serpents is required to unlock the Tsunami Archaic Magic spell.
1 - 793 Ranged Damage (Instead of repeating Water Dance while the effect is already active)
20% Water Dance
On use, gives the enemy +20% Damage Reduction, +20% Global Evasion, and -20% Attack Interval for 2 of the enemy's turns. If the buff is already active, the enemy performs a Normal Attack instead.
25% Torrential Dragonbreath
A torrent of water is blasted into you dealing 300 damage 40 times over 5.85s.
30% Giant Bubble
The enemy traps you in a large bubble dealing 800 damage. On a hit, applies sleep for 2 turns. Avoidable.
25% Tsunami
Giant waves rush towards you dealing 800 damage 3 times over 0.8s. On a hit, gives you +20% Attack Interval for 3 of your turns. Avoidable.
Passives
Intimidation
Reduce Player damage reduction by 29%
Duality
For each Target Attack Turn: 50% chance for the Target to apply -50% Attack Interval to itself for 2 turns
Foggy Lake Slayer area. Killing 100 Twin Sea Dragon Serpents is required to unlock the 
Tsunami Archaic 
Magic spell.
Twin Sea Dragon Serpent
Slayer Tier: Mythical
14,500
960
Magic Bones
.
Augite Arrows
Torrential Blast Crossbow Shard
Combat:
