While it's challenging for itself, it's the most difficult part - Wrath Altar is accessed via Myth's Guild by climbing down Mythic Statue and OSRS Gold then running through caves full of colored dragons. It's worth the effort. A side note: altar isn't accessible through Abyss and neither the output could be doubled.
It is necessary to have Fletching skills level of 70 as well as yew logs (Woodcutting skilled level 60) to cut the longbow yew (u) into them, then the bowstring (Crafting skilled level 10-10)) in order to tie the bow. The process of cutting and stringing the bow and stringing it will result in Fletching experiences.
Skill Herblore up to 25 in order clear Grimy Ranarr Weed The herb is found in combat skill level 13 Chaos Druids (which is a great cross gold making opportunity since Chaos Druids are able to be used for many valuable items) and you can continue doing it until you reach level 30 in Herblore skill. Once you reach that level, you'll gain the ability to make unfinished Ranarr potions. Then, as usual - put it on Grand Exchange and hope for huge profits.
Smelting bars is linked to Mining, you don't have to mine ore yourself - requirements for efficient smelting bar enough people from doing it is why it's beneficial to buy a lot of raw materials on the Grand Exchange, smelt it and then post it back as a refined good.
The required items and abilities are as follows : access to furnace coal for higher-level ores (and an extremely difficult to acquire coal bag) and, respectively, 15 30 50 70, and 85 Smithing level for bars shown below. Steel, Mithril, Adamantite, and Runite ore types require 2 4, 6 and 8 coal nuggets each an ore nugget in order to be able to Buy RuneScape Gold smelt the material properly. The smelting of iron bars is the chance of failing to stop you from losing your Ring of Forging.