according to several lores and reports, dwarves can´t survive daylight.
they stay underground or transform into toads to survive.
anyone has seen dwarves depicted as tiny old men that love jewels and gems and smithing, but who has ever seen a dwarven toad?
my other entries so far:
Robin Redcap - [link]
nuckela-wee - [link]
Golem of Prague - [link]