Normal Attack
Subzero Crystal
Stats:

Ice
CD: -
Summons ice crystals to attack the enemies to her front, dealing Ice DMG equal to 347.8% of ATK in total.
Passive:
Poseidon can have up to 2 of the Snowy and Icy Marks.
Energy: Poseidon is granted 3 Energy per second.
Stats:

Ice
CD: 9s
Summons an ice spike to attack her target, dealing Ice DMG equal to 561.5% of ATK in total. Tap on the skill again a short time into the skill action to also cast Additional Chant.
Additional Chant: The ice spike breaks into pieces and attacks again, dealing Ice DMG equal to 449.1% of ATK in total. 1 Snowy Mark is also granted.
Poseidon is granted certain effects depending on the number of Snowy Marks expended to enter Edgy state:
1 Snowy Mark: Poseidon's Ice DMG is increased by 10%, and casting Zero Mansard shortens the remaining cd of Zero Mansard by 3 seconds.
2 Snowy Marks: Poseidon's Ice DMG is increased by 30%, and casting Zero Mansard shortens the remaining cd of Zero Mansard by 7 seconds.
Stats:

Ice
CD: 12s
Summons an icicle to pierce the locked-on enemy, dealing Ice DMG equal to 374.4% of ATK in total and inflicting Freeze on enemies hit for 4 seconds. Tap on the skill again a short time into the skill action to also cast Additional Chant.
Additional Chant: Generates a continuous ice blast around the enemies hit, dealing Ice DMG equal to 449.2% of ATK. 1 Icy Mark is also granted.
Poseidon is granted certain effects depending on the number of Icy Marks expended to enter Edgy state:
1 Icy Mark: Hits landed on the enemy lower their Ice Res by 1% for 10 seconds, up to 20% in total. Casting Matter Frozen shortens the remaining cd of Matter Frozen by 4 seconds.
2 Icy Marks: Hits landed on the enemy lower their Ice Res by 2% for 10 seconds, up to 20% in total. Casting Matter Frozen shortens the remaining cd of Matter Frozen by 9 seconds.
Stats:

Ice
CD: 25s
Casting Snow Echo after a Zero Mansard or Matter Frozen attack will repeat the previous skill attack and grant the corresponding Snowy or Icy Mark. Said casting will also come with the corresponding Additional Chant follow-up attack. When Poseidon has 2 of either Mark, Snow Echo is replaced by Silver Frost.
Silver Frost: Expends all Marks for the corresponding effects when cast. Poseidon fires three silver frosts in the direction of the locked-on target, dealing Ice DMG equal to 1310% of ATK to enemies along the way. The cd of Zero Mansard and Matter Frozen is reset, and Poseidon enters Edgy state for 8 seconds.
Edgy: When in Edgy state, Poseidon may not use Skill 3 and will not be granted any Snowy or Icy Marks, though a Zero Mansard or Matter Frozen attack will be followed up with the corresponding Additional Chant attack.
Ultimate Skill
Frosty Starfall
Stats:

Ice
CD: 20s
Summons multiple icicles to attack the locked-on enemy, dealing Ice DMG equal to 1572.2% of ATK in total. Casting Frosty Starfall also shortens the remaining cd of either Skill 1 or Skill 2 for all members of the team if either Icy or Snowy Marks are active, and depending on the number of Marks active.
1 Snowy Mark: The remaining cd of Skill 1 is shortened by 3 seconds for all members of the team.
2 Snowy Marks: The remaining cd of Skill 1 is shortened by 7 seconds for all members of the team.
1 Icy Mark: The remaining cd of Skill 2 is shortened by 4 seconds for all members of the team.
2 Icy Marks: The remaining cd of Skill 2 is shortened by 9 seconds for all members of the team.
An 8% Ultimate Skill charge is also granted when Freeze is inflicted on the enemy. Effect can trigger once every 2 seconds.
Stats:

Ice
CD: -
Quickly dodges the enemy's attacks. Extremity Dodge triggers the Dodge effect.
Dodge: Entering Zero Time significantly slows all enemy movements for 3 seconds. Dodge effect can trigger once every 20 seconds.
TODO: add tooltip like ingame