Last updated: X.26.0.0

**Thessal the Mermaid Goddess** is the boss of the [Ocean Trench](/wiki/ocean-trench). The boss room has 4 air sources, that are each protected by a respawning Deep Sea Beast. If you are low HP, try to stay away from these as long as possible. Thessal will throw coral bombs that explode and split into 5 more bombs that explode to inflict more damage as well as possibly lethal Pet Stasis for *8 seconds*, heavily reducing survivability. This, combined with her armor breaking attacks, can make this fight a painful one. {{template-realm-eye-lore | response=Thessal is the ruler of the realm beneath the waves, but her kind had struggled to survive since mortals became capable of naval combat.
Her contact with the surface world is limited, but when Oryx came to her with a treaty for mutual protection, she agreed out of desperation.
With Thessal's dominion over sea monsters and Oryx's strengthening magic, the duo created the Hermit God to stop ships from ever setting sail again. }}

Stats

HP: 69,000 [+20% [13,800 HP] per player in dungeon] DEF: 60 EXP: 5,000 Location: Ocean Trench Immune to Stasis Immune to Paralyze Immune to Stun during Armor Break/Wave phases Counts to God Kills Dungeon Boss

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Combat

Attacks

Damage	Condition effects	Speed (tiles/sec)	Range (tiles)	Comments
100	Armor Broken for 4s	5.5	8.8	Pierces
65		7	21	Pierces
100		6	18	Pierces
120	Weak for 6s	6	18	Pierces

Behavior

Thessal stays in the middle of the room, firing radial bursts of golden bullets while going invulnerable for a short time during this attack. She can sometimes gain stun immunity for a few seconds and fire rings of gold spirals that inflict armor break. She also continuously spawns Coral Bombs which blow up and split into more Coral Bombs, quickly causing large storms of bullets. In addition, she constantly keeps a Deep Sea Beast on each of the 4 air vents in the room, making it much harder to regain air. If one dies, she will instantly respawn it. Sometimes, she will quickly move into the center of the room, flash and become stun immune for a few seconds, and then fire several rings of highly damaging shockwaves that inflict Weak for 6 seconds. As she loses health, her attacks gain frequency and her armor breaking bullets increase in number. When she is at low health, she gains an 8 second period of invincibility and fires her attacks much faster.

Dying Thessal He lives and reigns and conquers the world

He lives and reigns and conquers the world

HP: 960,000 DEF: 60 EXP: 0 Counts towards God Kills Level 20 Quest Occasionally and purely randomly, when Thessal is killed she will crumble over the loot bag and ask, "Is King Alexander alive?" If you respond with "He lives and reigns and conquers the world," she will say "Thank you, kind sailor" and spawn 3 Coral Gifts. Otherwise, after a few seconds, she'll shout "You speak LIES!" and suddenly attack. If you are standing on her (not smart), this will be instant death. Period. Unlike before, Dying Thessal fires all her attacks simultaneously and constantly, making it much more difficult to put her down for good. She has an immense amount of HP in this form, but will self-destruct after a couple of seconds. Attacks:

Damage	Condition effects	Speed (tiles/sec)	Range (tiles)
100	Armor Broken for 4s	5.5	8.8
65		7	21
100		6	18
120	Weak for 6s	6	18

Reproduction

Spawns:

Coral Bomb Big

Deep Sea Beast

Coral Gift

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Drops

Thessal drops the "Coral Huntress Set"

{{template-drop |purple= {{template-drop-row|first=true |item1={{template-item-link|page=mark-of-thessal|name=Mark of Thessal|externalIcon=//i.imgur.com/w5uuI9K.png|guaranteed=SB}} }} |goldenSpan=2 |golden= {{template-drop-row|first=true |item1={{template-item-link|page=golden-cockle|name=Golden Cockle|icon=Misc%20items/Golden%20Cockle.png}} |item2={{template-item-link|page=golden-conch|name=Golden Conch|icon=Misc%20items/Golden%20Conch.png}} |item3={{template-item-link|page=golden-horn-conch|name=Golden Horn Conch|icon=Misc%20items/Golden%20Horn%20Conch.png}} }} {{template-drop-row |item1={{template-item-link|page=the-moon-tarot-card|name=The Moon Tarot Card|icon=Misc%20items/The%20Moon%20Tarot%20Card.png}} |item2={{template-item-link|page=pet-skins|name=Sea Slurp Pet Skin|externalIcon=https://static.drips.pw/rotmg/wiki/Pets/Aquatic/Sea%20Slurp.png}} }} |cyan= {{template-drop-row|first=true |item1={{template-item-link|page=coral-silk-armor|name=Coral Silk Armor|icon=/Untiered/Coral%20Silk%20Armor.png}} |item2={{template-item-link|page=coral-ring|name=Coral Ring|icon=/Untiered/Coral%20Ring.png}} |item3={{template-item-link|page=wine-cellar-incantation|name=Wine Cellar Incantation|icon=Consumable/Other/Wine Cellar Incantation.png}} }} |blue= {{template-drop-row|first=true |item1={{template-item-link|page=potion-of-mana|name=Potion of Mana|icon=Consumable/Stat Potions/Potion of Mana.png|guaranteed=?}} }} |white= {{template-drop-row|first=true |item1={{template-item-link|page=coral-bow|name=Coral Bow|icon=Untiered/Coral Bow.png}} |item2={{template-item-link|page=coral-venom-trap|name=Coral Venom Trap|icon=Untiered/Coral Venom Trap.png}} }} }} Back to top

Tips and Strategies

If you have a small group or if you expect the fight to last a long time, it can be helpful to clear the room right before Thessal's so that you have access to an air vent that is not guarded by Deep Sea Beasts. This also prevents unwanted confuse or paralyze enemies joining the fight. When in combat, do not hug Thessal, because she will sometimes move forwards very fast and instantly let loose a huge circle of shots. If you are hugging her, you won't have time to back away, and her shots will do massive damage, which could lead to an insta-kill. ### Trivia Thessal is based on a Greek legend called "The Legend of Thessalonike". In the legend, Thessalonike was the sister of King Alexander the Great. When the King died, Thessalonike tried to kill herself by jumping into the sea, but became a mermaid instead of dying. She then asked sailors who encountered her: "Is Alexander the King alive?" She would only let them pass if they answered: "He lives and reigns and conquers the world." Any other answer would cause her to fly into a rage and destroy the ship and its crew.

Back to top ### History In Release X.12, the Thessal fight received a significant buff because it was considered to be extremely easy with even a small group of players, to the point of Thessal dying in seconds with a medium-large group. The following changes were made: * Paralyze immune * HP increased from 69,000 to 96,000 * Coral Bombs inflict Pet Stasis for 8 seconds * Yellow Wall inflicts Weak for 6 seconds * Increased Thunder Swirl Armor Break duration from 2.4s to 4.0s * Can't be stunned during Armor Break and Yellow Wall phases (warns with purple flash at the end of Tridents) * Small invulnerability during Tridents (2.6s) and at the start of the last phase (8s) * Shoots Tridents faster in the first phase, Armor Break slightly faster in the first and second phase * All shots (including Coral Bombs’) now pass through players * Deep Sea Beasts inflict Slowed for 2 seconds In Release X.26, additional changes were made, which include reverting Thessal's base HP back to 69,000 but giving her HP scaling this time, alongside the Coral Gifts which received a significant HP boost and HP scaling as well. The [Arctic Bow](/wiki/arctic-bow) has previously dropped from Thessal (winter 2016-17 only). Back to top

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