However,it's crucial to remember that enjoyment should be your top priority. Trying to maximize efficiency at the cost of fun can lead to RuneScape gold burnout. So,while these recommendations are based on XP efficiency,always be sure to strike a balance with tasks that you enjoy doing.

When you first start,you have five available slots to block tasks on the Slayer Block List. But once you hit 300 quest points,you unlock a sixth slot,and upon completing the Lumbridge Elite Diary,a seventh slot becomes available. For players planning to dedicate significant time to OSRS,obtaining the Quest Cape should be a key goal,as it provides access to additional quest rewards and unlocks. Diaries also provide valuable benefits and XP boosts,which can significantly aid your Slayer journey.

Assuming you've unlocked all seven slots and are using Duradel or Kuradel (if you've completed the "While Guthix Sleeps" quest),let's dive into the monsters you may want to block in your Slayer journey. Keep in mind that this list isn't ranked but rather highlights some of the worst offenders for XP efficiency.

Hellhounds
Hellhounds are one of the first monsters that highlight a common theme across this list—single-target tasks are less efficient than multi-target ones. To maximize XP per hour,it's better to focus on monsters you can use a cannon or area-of-effect spells like Ice Burst or Ice Barrage on. Hellhounds are relatively slow to kill and drop few valuable items,mostly dropping low-value items such as clues,Ensouled Heads,or the rare Smoldering Stone. Despite their potential for AFK gameplay and the decent drops from their boss,the experience per kill is underwhelming compared to faster,multi-target alternatives.

Cave Krakens
Like Hellhounds,Cave Krakens have a high Slayer task weight,meaning they're a frequent assignment that you'll want to avoid. These monsters also can't be killed using melee or ranged combat,limiting you to using a Trident of the Swamp or other single-target magic weapons. Their drop table is also lacking,with few valuable items to offset the slower kills. For these reasons,Cave Krakens are a prime candidate for your Block List,as they take considerable time to kill while offering minimal rewards.

Black Dragons
Black Dragons are another task that may seem like a good challenge,but ultimately is slow and inefficient. Not only do they have high hitpoints,but you'll need either an Anti-Dragonfire shield or an Antifire Potion to protect yourself from their devastating breath attack. While you can earn Dragon Bones for Prayer XP,they also have high defenses and require expensive equipment like the Dragon Hunter Lance for optimal kills. Plus,Duradel typically assigns only 10-20 of these dragons,which isn't ideal since you're aiming to kill large groups of monsters to cheap OSRS gold maximize XP per task.