Normal Attack
Scythe Slash
Stats:

Wind
CD: -
Summons a scythe and continuously slashes at the target, dealing Wind DMG equal to 570% of ATK in total.
Judge of the Underworld mode: Osiris unleashes sword wings to mow down the locked-on target, dealing Wind DMG equal to 562.2% of ATK in total.
Traces: The third and fifth moves of her normal attack grants 1 Trace each. When a hit is landed with the fourth strike of a normal attack while Osiris is in Judge of the Underworld mode, 1 Trace is also granted.
Stats:

Wind
CD: 12s
Throws her scythe at the target, dealing Wind DMG equal to 539.7% of ATK in total.
Judge of the Underworld mode: Osiris fires sword wings at the target, dealing Wind DMG equal to 898.3% of ATK in total.
After Darkwing Scythe is cast, 2 Traces can be expended to unleash another attack, which will however not grant any more Traces.
Traces: Each time skill cast results in a hit, 2 Traces are granted (regardless of the mode Osiris is in).
Stats:

Wind
CD: 8s
Sends the scythe into a deadly spin dealing Wind DMG equal to 935.8% of ATK in total.
Judge of the Underworld mode: Osiris summons sword wings that surround her and attack enemies in their way a total of 26 times, with each attack dealing Wind DMG equal to 56.1% of ATK. Lasts 6 seconds.
Stats:

Wind
CD: 12s
Slashes her scythe upwards at the target, dealing Wind DMG equal to 1235.4% of ATK in total.
Judge of the Underworld mode: Osiris gathers the enemy in front of her, and deals Wind DMG equal to 1871.8% of ATK in total.
Ultimate Skill
Hell to Pay
Stats:

Wind
CD: 20s
Escapes her ghostly shackles momentarily and enters Judge of the Underworld mode with her HP restored to full.
Judge of the Underworld mode: Changes the way the attack takes place with Scythe Slash, Darkwing Scythe, Spin of Death, and Soul Death. All members of the team get a 17% DMG boost until the Judge of the Underworld mode ends, and Osiris is granted Super Armor but loses 7% HP every second. Osiris exits Judge of the Underworld mode when her HP falls to 0 and returns to her original state.
After Osiris exits Judge of the Underworld mode, restores an Ultimate Skill charge to Osiris equal to that of the Mod with whom she has a preset Ultimate Skillchain. Where no such Mod exists, also restores to Osiris an Ultimate Skill charge even when still in Judge of the Underworld mode.
A 35% Ultimate Skill charge is granted to Osiris and the Mod with whom she has a preset Ultimate Skillchain when she enters the battlefield.
An 8% Ultimate Skill charge is also granted when an enemy is inflicted with Weak (Osiris must not be in the Judge of the Underworld mode). Effect can trigger once every 2 seconds.
Stats:

Wind
CD: -
Quickly dodges the enemy's attacks. Extremity Dodge triggers the Dodge effect. When Osiris is not in Judge of the Underworld mode, triggering Dodge also unleashes an attack on the enemies around her which deals Wind DMG equal to 449.2% of ATK in total.
Dodge: Entering Zero Time slows all enemy movements significantly for 2s and inflicts Weak on attackers, lowering their ATK by 10% for 3 seconds. Dodge effect can trigger once every 14 seconds.
TODO: add tooltip like ingame