27.0 - Invention
27.1 - Description
Invention is one of the most complex skills in the game. Not only is it a 120 skill, but it has byfar the most stuff in it.
There are components (obtained by disassembling items). You can unlock more components by leveling the skill.
There are items (made at an inventors workbench). You can unlock more items by discovering them first by using a blueprint at an inventors workbench.
There are gizmos, which improve the ability/rates of other skills. Due to this one I advise unlocking Invention as soon as you can.
There are machines you can use at the Invention guild to do things like alching/disassembling for you, AFK.
Yeah, Invention is pretty good.
Being an elite skill, Invention is the hardest one to level early on.
Getting the skill to 70 requires ~7.4 million exp. (6.6m more than regular)
Getting the skill to 99 requires ~36 million exp. (22m more than regular)
However, getting the skill to 120 requires ~80 million exp. (24m less than regular)
27.2 - Starting out
Starting Invention requires:
80 Divination
80 Crafting
80 Smithing
Once you have these, talk to Doc in the Invention guild located north east of Falador lodestone. Or you can set a Max guild garden portal (at Prifdinnas, doesn't require Max cape) to teleport you there.
When you unlock Invention, the skill will no longer be greyed out, you will have a components pouch next to your cash stack (4th button) and your tool belt will have more items on it.
You will be instantly put to Level 3-4 Invention after the short tutorial.
I advise disassembling items for components to start with. They will help you to simply have in your pouch and will give you starting levels.
For further items to disassemble and what components they give, there is a guide later.