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Achieving 99 Slayer in Old School RuneScape (OSRS) is a journey that requires patience,perseverance,and a lot of time. For those who have reached the coveted 13,034,431 XP in the Slayer skill,the importance of optimizing tasks using the Block List becomes abundantly clear. After all,hitting 99 Slayer is not something most players grind out in RuneScape gold a few days; it's an achievement earned over a long period,usually as you train your combat skills through regular Slayer tasks.

Since Slayer is an auxiliary skill,it's generally something that complements your combat training rather than being the sole focus. Because of this,players often prefer to make the grind more bearable by avoiding certain monsters. This is where the Block List becomes essential. By spending 100 Slayer reward points,you can block a task,and over time,this can really help in optimizing the XP gains. For players striving to make the most of their Slayer experience,this guide will identify monsters that are better blocked,to keep the grind as smooth and efficient as possible.

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 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 buy RS gold faster,multi-target alternatives.