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Fletching

You can train Fletching with the /fletch command. For example, /fletch name:Adamant dart quantity:10000. To start off training Fletching, you will want to /chop some logs for arrow shafts, and then /fletch name:arrow shaft them into arrow shafts. Alternatively, you can buy logs or unfinished fletching supplies from the #grand-exchange channel in the support server.
To see all the items you can fletch, check out the Fletching Wiki Page - most of the items found there are fletchable in the bot, having the exact same level and item requirements.