Magic Dart

Magic Dart (also referred to as Slayer Dart) requires 50 Magic and 55 Slayer to cast; in addition, a slayer's staff or Staff of the dead must be equipped to cast it. Slayer dart is popular among magic users when doing the Barrows minigame as it hits frequently, and the runes required are a common reward from the minigame.

Magic dart is one of the only spells which has a max hit that increases with magic level along with trident of the seas autocast spell

The max hit of slayer dart is equivalent to the left digit of your magic level plus 10. So if your magic level is 60, the max hit would be 16. If your magic level is 70, the max hit is 17, and so on.

Rune Cost
It is required that you have a slayer staff equipped to use the 'Magic Dart' spell, more commonly known as 'Slayer Dart.' Each cast also costs 1 Death rune and 4 Mind runes. This makes it a popular choice for players with a high magic level as it's a cheap way to hit 17-19 at 70-90 magic. In addition, because the spell is only level 50, it is slightly more accurate than higher level spells.

Special trait
Contrary to common belief of players, slayer dart is indeed affected by magic accuracy and magic bonus. Some monsters that slayer dart is used on just have such low magic defence that the spell is likely to hit with almost any magic attack bonus, even with negative magic attack.