Tips For Slaying Dark Beasts
Last night I got my first dark beast task, they took a while for me to find because it’s been ages since I did the mournings end quests but I found it in the long run. 
To do dark beasts you have to have 90+ slayer and have to atleast started mourning’s end 2. They are level 182 and have 225 hitpoints and also give 225 slayer exp each, aswell as around 900 experience in your method of killing. Dark beasts are always aggressive and attack with magic and melee, the magic attack is only the first attack if you are out of range of their melee attack (if you stand still its only 1, if you move its more then 1). The magic attack looks like a fire blast spell.
This is the equipment I took to the dark beasts.
I took the strength cape (t) because I was after prayer bonus more then strength, you can use fire cape if you prefer. The proselyte armour is for prayer bonus, and the saradomin sword is for an extra inventory spot for when you have to wear the mourners gear to enter the area aswell as extra prayer bonus. You can use a whip and shield if you like, but I prefer taking an extra prayer potion then having an extra free space. There is a rune mining rock located in the far north west section as seen in the picture below so if you have 85+ mining it might be worth taking a rune pickaxe aswell for the occasional runite ore.
The only things I missed with my inventory was to swap the ardrougne teleport tablets to the karmaja gloves and to take a holy wrench to make the prayer pots last more, but the 16 prayer potions I took was enough for the 167 dark beast task, with 2 doses to spare.
The dark beasts are the only monster that drops the dark bow, I was lucky enough to get one on my first task, pretty quickly too I think it was within the first 50 kills or so. They drop alot of adamant square shields, and death talismans and a decent amount of chaos, death and blood runes. Dark beasts seem to be good for blue charms too as you can tell from my loot picture below.
I used protect from melee prayer all the time as that is what they mainly attack with, be careful if you see someone else slaying dark beasts, as the dark beasts can swap opponents if someone gets to close to each other. If you need space while killing the dark beasts, you can drop the new key because you can always get another one from the desk near the head mourner which is near the entrance of the dark beasts.
To enter the dark beast lair you have to be in full mourner gear and have no other visible items on and the new key to unlock the door. An example of this is in the picture below.
Slaying dark beasts can be very long and boring but well worth it in experience and loot wise, this task took about 2-3 hours. If you have any questions about the guide let us know and we will try to help as much as we can.
Have fun slaying dark beasts and good luck with your dark bow drops.
