If you've been assigned Banshees as your Slayer task and want a smooth, efficient way to handle them--this guide has you covered. We'll cover everything from gear, safe spots, and travel methods to the best training strategies whether you're a low-level player or just trying to power through Slayer tasks.
Variants

Twisted Banshees are stronger variants of banshees that require level 15 Slayer to kill. They are found exclusively within the Catacombs of Kourend, in a multicombat area. There is a safespot in the walkway between the two rooms. Players must wear earmuffs or a Slayer helmet while fighting them to avoid the effects of their screams, which cause the player to take 7 damage and have their stats greatly reduced in Attack, Strength, Defence, Ranged, Magic, Prayer, and Agility with every attack received. They use magical melee, and their attacks are fairly accurate. These opponents seem to regenerate 1 hp each time they are attacked, regardless of whether your hit deals damage. As a result, Thralls, especially the lesser variants, are not very effective when fighting Twisted banshees.
Before you can be assigned Banshees as a Slayer task, you'll need to meet a few minimum requirements:

You must wear Earmuffs or a Slayer Helmet when fighting Banshees. Without them, you'll take constant damage (up to 6 per hit) and suffer stat drains. Earmuffs are easily purchased from any Slayer master or the Grand Exchange.
Since Banshees are undead, the Salve Amulet does boost your damage and accuracy. However, keep in mind that the Salve bonus does not stack with the Slayer Helmet--choose whichever is more relevant to your goals.
Although Banshees use Magic-based attacks they have no defensive stats--so any combat style works well against them. If you're struggling with their attacks, wear Ranged armor for its magic defense.
For quicker task completion, wear an Expeditious Bracelet. It has a 25% chance to double-kill count per monster, helping you finish tasks much faster.
The most common spot is in the Slayer Tower in Morytania. These level 23 Banshees are found on the ground floor, just past the Crawling Hands. They're weak and abundant, making them a very fast and easy Slayer task.

If you're looking for better loot and a bit more XP, you can also kill Twisted Banshees in the Catacombs of Kourend. They're level 89 but they can be safespotted easily.

While on a banshee Slayer task, there is a 1/200 chance that a Screaming Banshee will spawn after you kill a standard banshee (if you have Bigger and Badder unlocked). After claiming the elite tier rewards from the Combat Achievements system, this chance is increased to 1/150.

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Here are the fastest and most reliable methods of reaching the Slayer Tower (where most players will kill Banshees):
Arceuus Spellbook → Use either Fenkenstrain's Castle or Salve Graveyard teleports
Varrock to Paterdomus → Only if you're truly out of better optionsYes, you can safespot the regular Banshees in the Slayer Tower!
Stand north of the staircase on the ground floor, near the wall behind a torch. Lure a Banshee to the correct tile and attack from behind the obstacle. Once you get the lure down, it becomes a reliable safe spot to train from.
This method is ideal for low-level players using Magic or Ranged and looking to take minimal damage while training.

This is just an example gear set up, if you have better gear please don't be shy about using it, this is to give you a rough idea of what you need to carry and keep in mind that there will always be better options in terms of armor and weapons.
Melee Gear

Inventory

Ranged Gear

Inventory

Weapons and armour
Iron mace (1/64), Iron dagger (1/64), Iron kiteshield (1/128), Mystic gloves (dark) (1/512)
Runes
Air rune (1/42.67), Cosmic rune (1/42.67), Chaos rune (1/64), Fire rune (1/128), Chaos rune (1/128)
Herbs
Grimy guam leaf (1/15.1), Grimy marrentill (1/20.1), Grimy tarromin (1/26.8), Grimy harralander (1/34.4), Grimy ranarr weed (1/43.8), Grimy irit leaf (1/60.2), Grimy avantoe (1/80.3), Grimy kwuarm (1/96.4), Grimy cadantine (1/120.5), Grimy lantadyme (1/160.6), Grimy dwarf weed (1/160.6)
Materials
Pure essence (1/5.818), Iron ore (1/128), Fishing bait (1/5.818), Fishing bait (1/25.6), Eye of newt (1/128)
Gem drop table
Uncut sapphire (1/256), Uncut emerald (1/512), Uncut ruby (1/1,024), Nature talisman (1/2,731), Uncut diamond (1/4,096), Loop half of key (1/8,192), Tooth half of key (1/8,192), Rune javelin (1/8,192), Rune spear (1/131,072), Shield left half (1/262,144), Dragon spear (1/349,525)
Tertiary
Clue scroll (easy) (1/128)
Banshees are an excellent early-game Slayer task: fast, low-risk, and efficient. With proper gear (especially earmuffs or a Slayer helm), you can breeze through them. Players looking for more profit and slightly more challenge should consider Twisted Banshees.
Whether you're grinding points, XP, or just knocking out assignments, this is one of the more beginner-friendly tasks in Old School RuneScape.