Scandinavian Folk-Lore: Illustrations of the Traditional Beliefs of the Northern Peoples by William A. Craigie (1896)
-Live in waste-places [wastelands? Like places where people don't or can't live]
-May wrap themselves around churches and not budge
-Start out life small, indistinguishable from normal snakes
-One had brindled scales
-Grow very quickly by drinking milk. Will spare the person who gave them milk as a youngling when they're an adult
-Eat cattle and horses and people
-Dig up corpses from churchyards to eat
-In addition to their usual fare, they may eat all sorts of plant material: young shoots, grass, wooden crosses, etc. [this one instance was done by a lindorm wrapped around a church, so perhaps it couldn't/wouldn't go out to hunt?]
-Do not like tobacco
-Strong enough to strike a stone with its tail and leave a furrow
-Burrow underneath the ground, sometimes under churches [semi-fossorial, like most snakes]
-Not immune to heavy ordnance or a mad, three-year old bull
-Blood is poisonous and liable to kill their slayer if it's spilled heavily
Folktales of Norway by Reidar Thoralf Christiansen (1964)
-One was exorcised by flame, thirty ells long (112.5 ft)
-Lived alongside numerous other large, ugly snakes underneath the parishes in Trondheim
-Had a black mane
-Not immune to fire, however, as it perished after devouring the Lapp that had lured it into the ring of flames