In addition to the Kumano Nachi Grand Shrine goshuin, you can also get the Miagatahikosha goshuin. It features Yatagarasu. There is is lot of Yatagarasu imagery all over the Katsuura and Nachi area. According to legend, Yatagarasu guided Emperor Jimmu from Kumano to Yamato Province. You can also buy an omamori with Yatagarasu on it for victory.
Because the same person wrote them, this goshuin and the Kumano Nachi Grand Shrine one look very similar.
Kumano Nachi Taisha was the last location we visited before returning to Katsuura. It was very hot and humid that day, especially after the rain. Taking a bath in the onsen at Nakanoshima Hotel was a wonderful end to the day.
This goshuin is in my Nachi Falls goshuincho.