Lich was woken up by an unbearable stench of rotten blood, and the fact he slept in a hole under the road didn't make his sleep deep enough to resist that chemical attack.
He didn't need much time to know the source of this torturous smell.
It was his robe, that looked like it was stolen from a cult, yet it was actually made from a very expensive material used for high-ranking officers' uniforms. It had very low heat conductivity levels even after years of using, and could still (theoretically) stop a 9 mm bullet shot from a standard pistol from as little as 150 meters! But it was mainly used to make sure that the bullet doesn't go too deep into the target, by entangling its dense fibers.
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It could even fix itself, as long as you sew the "wound" and let it heal for a month. After that, you just remove the threads as if they're stitches, and the damaged item is as good as new!
And that piece of the rarest and most expensive cloth on earth was soaked in rotting blood.
'I guess I should wash it.'
He took out his maps (which altogether weight 1 kg), and looked for the nearest large body of water.
But there was no lake or river near enough for him to make a detour. He could probably look for something in the mountains, but there were still at least 3 days until he would get there.
The other choice would be using his drinking water, but finding anymore was not guaranteed, and he was not the biggest fan of turning to dust from dehydration.
So his only option was to go to the remains of the river's source.
So, while smelling the smelliest smell a man has ever smelled, he walked.