Hellhounds are one of RuneScape gold the most commonly blocked tasks for high-level players,and for good reason. They are single-target,have no notable drops (outside of the rare clue scroll or Smouldering Stone),and are not particularly fast to kill. While the Cerberus Slayer boss does drop valuable crystals like the Primordial,Pegasian,and Eternal,it's not a viable XP source — it's a money-making boss.

For XP-focused players,Hellhounds are a drain on time and resources. Plus,their high task weight means you'll see them assigned often unless you block them.

Like Hellhounds,Cave Krakens have a very high task weight and show up frequently. Unfortunately,they can't be killed efficiently with melee or ranged weapons — you're forced to use magic,and even then,it's single-target only.

Despite the chance at a Kraken Tentacle or Trident of the Seas,the Kraken is painfully slow XP and not worth the time investment if you're chasing 99 Slayer. The block list is ideal for high-weight,low-XP monsters like these.

Black Dragons are tanky,slow to kill,and logistically annoying. You'll need either a Dragonfire shield or Antifire Potions,and ideally a Dragon Hunter Lance for efficient kills — not a cheap investment for a Slayer-only task.

Duradel typically assigns them in buy Runescape gold very small amounts (10-20),which contradicts our goal of doing high-volume,high-XP tasks in safe spots or cannon-friendly areas. Sure,the bones are good for Prayer XP,but overall,Black Dragons just don't contribute meaningfully to Slayer XP gains.