you can speak, read, and write sylvan.

you can use the magic in your horn to move objects. it cannot be used to fight with weapons.

you can be ridden as if you are a horse but you cannot use any movement speed other than your walking speed while being ridden. while being ridden and in combat you take your turn right after your rider or your rider's summoned steed. also, while being ridden, your walking speed is used by you and your rider. you can only be ridden by your party members. also you can't be ridden by a party member that is larger than your size. you can be ridden by and party member that is the same size as you or smaller. while you are being ridden, you and your rider move like someone riding a horse but with you and your rider being able to each choose the direction you move.

you have advantage on saving throws against spells and other magical effects.

you can read, write, speak, and understand common.

you can read, write, speak, and understand Celestial.

you cannot attack something while flying unless your party's Dungeon master says otherwise.

you can use one of three slots to use either Healing Touch or Shimmering Shield. you can make this choice up to three times per long rest:

Healing Touch:

Healing Touch. You touch another creature with your horn. The target magically regains (2d8 + 2) hit points. In addition, the touch removes all diseases and neutralizes all poisons afflicting the target.

Shimmering Shield:

Shimmering Shield. The unicorn targets itself or one creature it can see within 60 feet of itself. The target gains (1d8) temporary hit points and the target's armor class increases by 2.

as a bonus action you can move up to half your speed without provoking opportunity attacks and then you can use (E.N.H.) Radiant Horn.

note: while you are being ridden, this ability is unable to be used.

once per long rest and as 1 action, you can use teleport.

Teleport:

Teleport. you magically teleport yourself and up to three willing creatures you can see within 5 feet of it, along with any equipment they are wearing or carrying, to a location you are familiar with, up to 1 mile away.

you have dark vision up to 60 feet.

you can walk or run up to 40 feet.

your carrying capacity is two sizes bigger than you.

your size is medium.

you can speak, read, and write telepathy.

if you enter an area that has grass, then after 20 minutes of you being in that area, you have eaten enough grass to fulfill your need for at least 1 meal for the day.

you can speak, read, understand, and write elvish.

you are resistant to poison.

after you make your character, manually make and choose the feat that is called, Tough, which states, "Your Hit Point maximum increases by an amount equal to twice your character level when you gain this feat. Whenever you gain a character level thereafter, your Hit Point maximum increases by an additional 2 Hit Points."

you get a (E.N.H.) A Steed's Saddle for free as part of the equipment you need in a campaign. this special riding saddle is used on you by a rider when you are being ridden.