Karma   

A whirlwind of slashes that tear into enemies.

PS3:
While on the ground, press L2+
Xbox:
While on the ground, press LT+ Y+Y+Y+Y

Cleaver   

Several swipes ending in a flesh rending downward slash.

PS3:
While on the ground, press L2+ , pause,
Xbox:
While on the ground, press LT+ Y+Y, pause, Y+Y+Y

Cleaving-Swap   

Two cleaving hits, finished with an alternate delay combo.

PS3:
While on the ground, press L2+ , change weapon, then
Xbox:
While on the ground, press LT+ Y+Y, change weapon, then Y

Raze   

Raise Dante and nearby enemies in a sweeping hurricane-like attack. Level 2 gives wider range on launch.

PS3:
While on the ground, press and hold L2+ , and release when blade glows.
Xbox:
While on the ground, press and hold LT+ Y, and release when blade glows.

Prop:   

Spin the scythe like a propeller, juggling enemies in the air.

PS3:
While on the ground, press L2+ O, hold for a longer duration.
Xbox:
While on the ground, hold LT and press B, hold for a longer duration.

Shredder   

An extension of Prop. Level 2 allows a longer duration.

PS3:
After Prop, press L2+ O, hold for a longer duration.
Xbox:
After Prop, press LT+ B, hold for a longer duration.

Streak   

A forward lunging attack that ends in a sweeping slash. Level 2 increases distance traveled.

PS3:
While on the ground, press Forward+Forward+
Xbox:
While on the ground, hold LT and press Forward+Forward+Y

Hanger   

An aerial combo of wide strikes capable of juggling.

PS3:
While in midair, press L2+
Xbox:
While in midair, press LT+ Y+Y+Y

Double Up   

Spins Osiris, lifting he and surrounding enemies higher. Level 2 increases height gain.

PS3:
While in midair, push L2+ , pause,
Xbox:
While in midair, push LT+ Y+Y, pause, Y+Y

Rake   

Hook enemies below and cast them into the air. Level 2 grants wider reach.

PS3:
While in midair, press L2+O
Xbox:
While in midair, press LT+B

Feed   

Osiris becomes more powerful when continuously striking enemies. Once charged it boosts damage from all attacks made with Osiris. Level 2 and 3 grant increase maximum damage bonus.

As a passive skill, there is no active button setting for this skill.