For the sake of RuneScape gold this guide,I'll assume that you have unlocked all seven block slots and are using Duradel as your Slayer Master (or Kuradel if you've completed the While Guthix Sleeps quest). Below is a list of some of the most annoying and inefficient Slayer tasks that you might want to block to maximize your XP gains.
1. Hellhounds
Hellhounds are a common Slayer task,but are not efficient for XP training. Although they offer decent AFK opportunities and a few valuable drops like the Primordial Crystal,their slow kill times mean you won't make fast progress towards 99 Slayer. Hellhounds also have a very poor drop table—outside of the occasional clue scroll,Ensouled Head,or rare Smoldering Stone,you won't make much money off these tasks. They can become especially frustrating if you're after the best possible XP per hour.
2. Cave Krakens
Like Hellhounds,Cave Krakens are also high-weight tasks that appear frequently,but they don't provide the best XP rates. These monsters are weak to magic,so you'll need to use a Trident of the Swamp or similar single-target magic weapon to kill them. The process is slow,and their drop table is underwhelming,meaning you won't earn much GP while completing the task. Given their high Slayer task weight,Cave Krakens are perfect candidates for your block list if you're aiming for RS gold for sale a more efficient Slayer grind.