In Old School RuneScape (OSRS), Slayer tasks play a key role in the game, offering players rewards and challenges as they hunt specific monsters. Completing these tasks not only grants Slayer experience but also boosts combat skills, while providing valuable loot and rare items. However, not all Slayer tasks are equally rewarding or efficient. Some are time-consuming or difficult, making blocking tasks an essential strategy for OSRS gold  improving efficiency and overall enjoyment.

When you block a task, it means that you won't be assigned it again. Players can block a set number of tasks based on their Slayer level, so it's crucial to pick tasks that are inefficient or frustrating to complete. Here's a list of some of the worst tasks to consider blocking in OSRS, based on difficulty, time, and rewards:

1. Abyssal Demons

Abyssal Demons are notorious for being a slow and difficult task. While they drop valuable items like Abyssal Whips, they have high hitpoints, deal considerable damage, and are often located in dangerous areas like the Abyssal Area or the Slayer Tower. Due to the time required to kill them and their low-value drops, blocking Abyssal Demons can be a wise decision for players seeking efficiency.

2. TzTok-Jad

TzTok-Jad is one of the most challenging tasks in the game. Defeating him requires excellent prayer flicking and high combat stats, particularly Ranged. The fight is long, often taking over an hour to complete, and although Jad's drops are decent, they don't justify the time and effort required. Many players block this task to avoid the stress and difficulty it brings.

3. Fire Giants

Fire Giants are another commonly blocked task, as they are low-level monsters that drop mediocre items. While they drop rune items, the slow kill rate and the high number of Fire Giants in a task make it monotonous and time-consuming. For players seeking more rewarding Slayer tasks, blocking Fire Giants is a common choice.

4. Nechryaels

Nechryaels are mid-level monsters with high hitpoints and long kill times. While they do drop valuable items like the occult necklace, the task is often inefficient and tedious, especially when assigned in large quantities. Many players block Nechryaels for the time it takes to complete the task compared to the relatively low profit it offers.

5. Kurasks

Kurasks are a task that can be frustrating due to their requirement for a leaf-bladed sword to kill them efficiently. Without this weapon, the task becomes much slower and less efficient. The drops, like the dragon chainbody or kurask head, are rare and don't provide enough value to justify the time investment. Therefore, blocking Kurasks is a popular choice for players who want to optimize their Slayer experience.

6. Dark Beasts

Dark Beasts are a tough task, requiring rare items like the dark bow or dark beast key to access them. They have high combat stats, long kill times, and deal significant damage. While they can drop valuable items, the low drop rate and high cost of completing the task make it a candidate for blocking for many players.

7. Basilisks

Basilisks are easy to kill but require a basilisk head, which is a rare drop. The task can become inefficient when players are assigned hundreds of Basilisks without the chance to obtain the head. Since the drops are not particularly rewarding, blocking Basilisks is a good choice for players focused on maximizing Slayer efficiency.

8. Jelly

Jellies are low-level monsters that drop runes and coins but have little value in terms of rewards. They are often assigned in high quantities, leading to long, tedious tasks with minimal payoff. For those looking to make their Slayer tasks more profitable, blocking Jellies is a common strategy.

9. Gargoyles

While Gargoyles can drop valuable items like the gargoyle smasher and gargoyle head, they have high hitpoints and require a significant amount of time to kill. They are often assigned in large numbers, making the task even more time-consuming. As such, many players choose to block Gargoyles to avoid lengthy tasks with limited rewards.

10. Spiritual Creatures

Spiritual Creatures, found in the God Wars Dungeon, are tough and require high combat stats to OSRS buy gold defeat. While they drop rare items like the god books, the low drop rates and high difficulty make this task time-consuming and inefficient. Many players choose to block Spiritual Creatures to avoid the frustration of dealing with this challenging task.