General Method Description

Mighty banshees are a tougher version of regular banshees, which are one of the best money monsters in the game. You gain access to them during the Smoking Kills quest, and can fight them any time thereafter as long as you wear either masked earmuffs or a Slayer helmet (if you've learned how to make one). Like their lower-level cousins, they are a great source of herbs and noted pure essence, and add to that cosmic runes, chaos runes and more.

Mighty banshees are located in a multicombat area, so you need to be careful fighting them -- they can hit pretty hard and are aggressive. The easiest way to fight them is to use prayer, but since the goal here is to make money, I describe a technique that uses armor and food instead.

With monsters that drop a large number of herbs, there are trade-offs between keeping all the herbs or leaving the lower-valued ones so you can try to get more of the ones that cost more. There is also a trade-off between using a beast of burden to get more herbs per trip, or summoning a macaw for its herb enhancing benefit, because the macaw increases the percentage of good herbs (ranarr and above) by a hefty 40%. The key factors that determine the best approach are the number of herbs you get per hour from the monster, the distance to the bank (and thus how much time you waste per hour banking if you take more trips) and the value of non-herb drops.

Mighty banshees drop large numbers of herbs, and they are extremely easy to get to -- only 30 seconds using a ring of slaying teleport to Sumona. For this reason I recommend using a macaw over a beast of burden, and keeping all of the herbs you get as drops.