Given this text about Heracles' twelve labors, construct a list of characters that either help him in his quest, how, and why.
- Iolaus, who helps him kill the Lernaean Hydra, since he is his nephew
- Artemis, who allows him to take the Golden Hind, after Heracles explains his situation
- Prometheus, who tells him that his brother Atlas knows the location of the garden of the Hesperides, in return for being saved by Heracles