Rue is the skilling pet obtainable from Runecrafting. She is unlocked by using Rue pet and requires no feeding.
This item may be obtained by training Runecrafting via making runes at altars, including the Ourania Altar, or in the Runespan. Gaining a pet is based on the amount of experience awarded at once; the more experience granted, the greater the chance of gaining a pet. Additionally, it has been found that Rue is obtainable from converting unstable essence. Thus, this may have the potential to increase the odds of obtaining the pet due to having a large influx of experience all at once from converting unstable essence at high-level Runecrafting altars. The chance is not affected by experience boosters.
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