HOHO! SPOILERS AHEAD MATEY!!
Read ahead at yer own risk!
"Bestows the Hivemother's Blessing on the owner. Used to chop down hallowed trees and allows access to the Hallowed Island"
Grandpa's Axe is a special item that grants the player access to the Hallows as well as lets them interact with the Hivemother Gate in the Hallows.
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Grandpa's Axe can only be gotten by completing the Guide Book, and can be claimed from the Overview tab when all quests are completed.
Once received the player will be able to chop down hallowed trees and interact with the menus in the Hallows. It is a key item that is required for game completion.
This item cannot be bought.
This item doesn't sell for anything.