Snake

Odin sought lodging for the night with a giant
called Baugi, Suttung’s brother. Baugi reckoned his economic
affairs were going badly, and said his nine slaves had killed each
other, and declared he did not know where he was going to get
workmen from. Odin told him his name was Bolverk; he offered
to take over the work of nine men for Baugi, and stipulated as his
payment one drink of Suttung’s mead.

[...]

Then Bolverk told Baugi that they would have to try
some stratagems to see if they could get hold of the mead, and Baugi
said that was a good idea. Then Bolverk got out an auger called
Rati and instructed Baugi to bore a hole in the mountain, if the
auger would cut. He did so. Then Baugi said that the mountain
was bored through, but Bolverk blew into the auger-hole and the
bits flew back up at him. Then he realized that Baugi was trying to
cheat him, and told him to bore through the mountain. Baugi
bored again. And when Bolverk blew a second time, the bits flew
inwards. Then Bolverk turned himself into the form of a snake
and crawled into the auger-hole, and Baugi stabbed after him with
the auger and missed him. Bolverk went to where Gunnlod was
and lay with her for three nights and then she let him drink three
draughts of the mead.


- Prose Edda, Skaldskaparmal