Sky Watcher

Steppe Centaurs often pair with Mountain Harpies to scout and hunt the open lands of their homes.  While it is a convenience for some, others partner for life, the centaur often dreaming of the winds flowing through ephemeral wings.

Harpy Companion

• Proficiency: Add your proficiency bonus to the beast’s AC, DC, attack rolls, damage rolls, all skill checks, and all saving throws.
• Initiative: The beast shares your initiative and takes its turn during yours. It can move on its own and follows your commands.
• Actions: You can use your bonus action to command the beast to take an action and bonus action, or when you take the Attack action you can sacrifice one attack to command the beast instead. If you are Incapacitated or absent, the beast can take any action of its choice. 
• Bonus Actions: Your beast can take the Dash or Disengage action using its Bonus Action.
• Attacks: Your beast's primary attacks deal 2d4 damage and can add its Str or Dex mod + your proficiency bonus to their attack and damage rolls. Damage type is determined by the creature's stat block.*
• Hit Points: Your beast starts with 18 + (its Con mod x 3) hit points. For every level your character gains after the 3rd level, your beast's hit points increase by 1d8 + its Con mod. It also has a number of hit dice equal to your character level and can use them during a short rest to regain hit points.
• Abilities: The beast keeps all abilities except Multiattack, and makes Intimidation skill checks with Strength instead of Charisma. Your beast can sacrifice an attack to Shove or Grapple a creature. The beast grapples using its natural weapons (such as teeth, claws, or talons) but cannot attack while grappling unless it has hands or an innate ability that allows it to.

If your beast dies, you can revive it within 24 hours if it's spirit is willing. The resurrection requires its body, takes 1 minute of concentration, and returns the beast to life with all its hit points restored. If you perform the resurrection without the beast's body present, the ritual takes 1 hour and both you and your beast gain a level of exhaustion after the ritual is complete. If the beast suffers a permanent death, you can obtain a new companion that meets the above requirements.

*Special attacks like Rock Throw and poisonous bites or stings deal the damage listed in the creature's stat block, but still gain your proficiency bonus to their primary attack and damage rolls. 

Sky Bound

At the 7th level, when you cast a spell targeting yourself, you can also affect your beast with the spell if it is within 30 feet of you. Your beast also benefits from your spell effects on opponents, such as the tracking and damage bonuses from Hunter’s Mark.

In addition, your beast’s attacks count as magical for the purposes of overcoming resistance and immunity to non-magical damage and attacks.

Fury of the Skies

At the 11th level, when you command your Harpy Companion to take the Attack action, the Harpy can attack twice, or it can use Multiattack if it has that ability.

In addition, your Harpy can take the Dodge or Help action using its Bonus Action.

Shatter the Skies

At the 15th level, your Hunter's Mark spell no longer requires concentration or a target. Instead, choose a creature or humanoid species to mark as your prey. You and your Harpy gain the benefits of Hunter's Mark against all creatures or humanoids of that type until the spell ends, or is moved to a different species.

In addition, you and your Harpy have advantage on all Strength and Dexterity skill checks and saving throws against any creature affected by Hunter's Mark.