I've discussed the refusal of the call already in part one of my examination of the Hero's Journey, as I personally consider it to be part of the call to action. The second step would therefore be Supernatural Aid, which often comes to the hero in the form of a mysterious elder.
Prof. Joseph Campbell: "For those who have not refused the call, the first encounter of the hero journey is with a protective figure ... The fantasy is a reassurance... that though omnipotence may seem to be endangered by the threshold passages and life awakenings, protective power is always and ever present within or just behind the unfamiliar features of the world. Mother Nature herself supports the mighty task."
The hero usually receives something at this stage of the journey, in the form of magic talismans, lightsabers, magic wands, or any other such artifact that imbues the hero with greater power than they had before they took up the call to adventure.
The hero need not receive something physical. Special training or secret knowledge granted by the mentor can also serve to prepare the hero for their trials ahead. Nor need there even be a mentor to provide training or the magic instruments needed for success; the hero can uncover the arcane knowledge by chance, or come across a horde of treasure and incredible weaponry all on their own.
Supernatural Aid, while an apt term in many cases of myth and fantasy, does not necessarily mean that magic must be involved. I would say that a better title for this stage might be Natural Aid. Like Professor Campbell said so well, this stage of the monomyth represents the hero becoming attuned to the natural world. This gives them an advantage over their fears and apprehensions. They are symbolically gifted maps and swords, but what they really receive is the encouragement of the gods, of nature, of the universe. They are now being compelled with aid from the life force itself, which enables them to prepare for crossing the next step of the Hero Journey, the first threshold.