RSorder OSRS: These monsters are notorious
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Black Dragons are another task that can be inefficient for Slayer. While they have decent hitpoints and decent drops for Prayer training,they can be cumbersome to kill. To RuneScape gold efficiently fight Black Dragons,you'll need to bring an Anti-Dragonfire shield or an Antifire Potion,plus a Dragon Hunter Lance,which is a very expensive weapon,especially when used exclusively for Slayer tasks. Duradel often assigns you 10-20 Black Dragons,which isn't ideal when you're looking for tasks where you can kill a large number of monsters in one area to maximize XP. While they do drop Dragon Bones for Prayer experience,there are better ways to earn GP and get more experience.
Greater Demons & Black DemonsBoth Greater Demons and Black Demons are high-weight tasks that should be blocked for similar reasons. These creatures are single-target,slow to kill,and have poor loot tables. Duradel tends to assign you 130-200 of these demons,meaning you'll be stuck grinding away at them for long periods with little reward. In addition,since these demons are often located in crowded areas,it can be tough to get a world where you're not competing with other players for kills. While they do drop useful items for Ironmen players,including the Slayer Helm and Emberlight,for the average player,these demons are best avoided.
Spiritual CreaturesThese monsters are notorious for being some of the most annoying creatures to fight in OSRS. Located in the God Wars Dungeon,they have a very high Slayer task weight and are difficult to access. Without the right God Wars Dungeon gear,you'll find yourself constantly being attacked by other monsters while trying to focus on your task. Their loot table is also quite terrible,and the main reward is typically only Dragon Boots,which aren't particularly lucrative. For many players,Spiritual Creatures are among the first monsters they block,and for good reason—they're a hassle to RS gold for sale deal with,and the rewards don't justify the effort.