Although Mithril Dragons are unlocked through Slayer tasks and offer good experience for RuneScape gold higher-level players,their slow kills and low drop rates make them inefficient. They have a high defence level,making them challenging to kill without using powerful weapons and high-level prayers. Given their lack of good drops and high task weights,they don't fit well into an optimized Slayer strategy.
Conclusion

When you're grinding towards 99 Slayer,your primary focus should always be maximizing XP efficiency while keeping the grind as enjoyable as possible. While it's tempting to always aim for the most efficient tasks,don't forget to prioritize fun. Some tasks might not be as rewarding in terms of XP,but they can offer a break from the more intense grinding.

By blocking the right monsters and selecting the most efficient tasks,you'll be able to speed up your Slayer journey. The tasks listed above—Hellhounds,Cave Krakens,Black Dragons,Greater Demons,Spiritual Creatures,Steel Dragons,and Mithril Dragons—are prime candidates for blocking if you want to focus on high-XP tasks with better drops.

Ultimately,the Slayer grind is a marathon,not a sprint,and managing your Block List effectively is one of the keys to RS gold success.