Tomokratis

Most krakens roam the seas, shattering hulls and scattering fleets, but the Kraken Tromokratis notoriously vents its wrath on Coastal Settlements. Whether it acts at the Command of the god Thassa or to sate its own hunger, Tromokratis numbers among the most feared threats in The Sea, having no fixed lair and wandering where it will. In Recent Memory, the massive menace rose from the waves to topple the Pyrgnos, Meletis's great Repository of scholarly knowledge. Since that day, the polis keeps a watch specifically for Tromokratis.
Tromokratis is a particularly cantankerous nadir Kraken that has claimed all The Sea as its territory. A tumultuous sea is often attributed to Tromokratis battling another Kraken to assert its claim. Often, before a journey, sailors blow conch-shell horns in the belief that the sound will soothe nearby krakens.
Legend speaks of a magic horn that the hero Humenades used in ancient times to summon Tromokratis to lay waste to a Cursed city lost to evil ways. The horn was so powerful that, after the city was destroyed, Humenades took it to Tizerus and buried it under a stone near the palace of Erebos.