Behavior<\/h4>\nThessal is found in a large square room at the end of the Ocean Trench, with each side having a small alcove with an air vent for players to restore oxygen with. Upon being approached, she will immediately attack.\n\n
Phase 1<\/h4>\nThessal wanders in the middle of the room, cycling between two attacks:\n\n
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Rapidly firing 4-way pairs of gold Super Tridents nine times, alternating between firing them along the cardinal and diagonal directions. Right before using this attack, Thessal will go invulnerable for 1.6 seconds.<\/li>\n
Flashing pink and firing four rings of 8 gold Thunder Swirls that inflict {{template-armor-broken}}. Thessal gains immunity to {{template-stunned}} during this attack.<\/li>\n<\/ul>\n\nDuring all attacks, she will also continuously throw Coral Bombs, either directly at players or in random spots in the boss room. These will explode into a ring of pink {{template-pet-stasis}} shots and each split into six smaller Coral Bombs that do the same, quickly causing large storms of bullets.\n\nIn 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 respawn it after a short delay.\n\n
Phase 2<\/h4>\nAt 50% HP, Thessal flashes yellow, moves to the center of the room, and fires three dense rings of shockwaves that inflict {{template-weak}}, also gaining Stun Immunity for this attack. After using it for the first time, she will use this attack again after every Thunder Swirl attack. Her prior attacks will also be improved:\n\n
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Her Super Trident attack now fires 11 times with increased frequency<\/li>\n
Her Thunder Swirl attack now fires 16 shots per ring.<\/li>\n
The frequency and number of Coral Bombs she spawns will be increased.<\/li>\n<\/ul>\n\n
Phase 3<\/h4>\nAt 20% HP, Thessal will immediately use her shockwave attack again, but will also go invulnerable for 8 seconds upon hitting the HP threshold. \n\n
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Her Super Trident attack will now fire 13 times in succession with the delay between cardinal\/diagonal bursts significantly reducing (giving the impression of her simultaneously firing diagonally and cardinally). This does not include the first burst, which will be normal.<\/li>\n
Her Thunder Swirl attack now fires 5 times in succession with slightly less delay between rings.<\/li>\n
The frequency\/number of her Coral Bombs will go up again.<\/li>\n<\/ul>\n\n
\nDying Thessal<\/b>\n \n<\/div> \n \nOccasionally, either by pure luck or if the dungeon has the \"Alexander's Legacy I\/II\" modifier,, when Thessal is killed, instead of dying, she will crumple over the loot bag and ask, \"Is King Alexander alive?\"<\/b> If you respond with \"He lives and reigns and conquers the world\"<\/b>, she will say \"Thank you, kind sailor.\"<\/b> and spawn 3 Coral Gifts before vanishing. \n\nIf nobody says the right answer after a few seconds, she'll shout \"You speak LIES!\"<\/b>, suddenly rising up, going invulnerable, and launching a relentless attack consisting of all her attacks simultaneously fired at a nonstop pace. After roughly ten seconds of attacking, Thessal will self-destruct (although her original loot will still have already been dropped).\n\nIf you are standing on her when this happens (not smart), this will be instant death. Period.<\/b> \n \n