How do you open ptolemos in trail of spheres?

To open Ptolemos in "Trail of Spheres," you need to complete the necessary quests that lead to unlocking this aspect of the game. Typically, this involves solving puzzles, defeating specific enemies, or collecting certain items related to the storyline. Once these prerequisites are met, you can access Ptolemos through the designated area or portal in the game. Be sure to check the in-game hints or guides for any specific requirements related to your progress.