The Blessed Apple is a Hardmodemount summoning item. When used, it summons a rideable Unicorn Mount that gives the player an extra jump as well as the ability to sprint and charge through enemies, damaging them in the process. It can be dropped by all Hallow-related enemies, with a 0.5% / 0.67% (1/200 / 1/150) chance to drop.
Once a high speed is reached, the Unicorn emits a sparkle effect, and from that point on, the Unicorn will be able to damage enemies on contact. The invulnerability is granted for 1/10 second when the player and the Unicorn dash through an enemy, much like the brief invulnerability after taking damage. Dashing through enemies while riding this mount will deal 80 base damage to them, excluding defense. This damage benefits from effects that boost summon damage.
Its speed reaches 61mph, according to the Stopwatch. At top speed, it is nearly twice as fast as a player wearing Lightning Boots and is equivalent to the Wisp in a Bottle's top speed. However, the Unicorn Mount can reach up to 80mph when falling down after having reached max speed.
A Unicorn does not benefit from the effect of Asphalt Blocks, making players with Lightning Boots travel slightly faster on these blocks (64mph with boots and 61mph on a Unicorn). The Unicorn also does not benefit from Swiftness Potions.
While riding the Unicorn, the player will be damaged by one-block-deep lava, but not given benefits or slowed down by one-block-deep honey.
While the player is mounted on the Unicorn, they will only take 20% fall damage, though they will take fall damage regardless of whether or not they have any fall damage negating accessories equipped, such as the Lucky Horseshoe or a set of Wings, but only if the player jumped from a big height with the unicorn mount.
The Unicorn makes the player five tiles in height, unlike most other mounts, which only raise the height to four tiles.
All items providing an extra jump, like the Cloud in a Bottle, will stack with the mount, allowing a triple jump. If a Bundle of Balloons is equipped, it is possible to jump 5 times before hitting the ground.
When using the double jump, the player has a green and yellow sparkling effect in the mount's trail. The color of the particles created by double jumping, as well as charging, are affected by dyes.
Even though the Blessed Apple's drop chance is quite low, considering it drops from all Hallow enemies, the mount is quite common, and is usually the first Hardmode mount obtained.
The Unicorn mount is arguably one of the best pre-Plantera mounts for its damage protection and ability to attack when moving at high speed.
Mounting the Unicorn while dashing using the Shield of Cthulhu (or items with similar effects like the Tabi) will allow reaching the Unicorn's max speed instantly.
Using this mount against the Old One's Army can make the event trivial without too much major mechanical boss and post-mechanical-boss progress.
Trivia
Using any auto-firing weapon such as the Terra Blade, yoyos, or a Minishark, and firing it in the opposite direction the player is walking in will cause the Unicorn to walk "backwards".
The Unicorn on flat ground travels at the same speed as an unmodified Terra Blade beam.
The color of the Unicorn Mount differs from that of the Unicorn. In contrast to this, the achievement Rainbows and Unicorns seems to use the coloration of the enemy.
The saddle on the mount sprite is the same coloration as the summoning item itself.