Well if you want the slowest xp but the cheapest way to 99 crafting. Well here it is, 1-99 cut opals all the way but this will take a while as in (5 months) you will need to cut atleast 1m opals but it can make you some money depending on the price of them.
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here's the best way to get a high level runescape acount. make an acount train all skills to 70 then train bandits till you have 99 in every combat skill. now you have a high level runescape acount :)
I would say an Ibis is the best way to level summoning in terms of Shards used and exp given.
The best way to fish on runescape is to use a net or a fishing rod and bait in draynor. Then it is easy to bank your fish
Seriously, the fastest way from level 90-99, is Soul Wars. It takes 2 weeks to get the 1000 points and every 100 points gets you a level.
The easiest way is with a mystical lamp.