“ L1 wizard spell
This spell must be cast for 31 consecutive days by one wizard to create a +1 sword,-2 to anyone else holding it(other than sword owner).No special ingredients or quality of blade, the only requirement on this part is it must be a short sword or longer and must be a true sword. The sword must draw blood from a living creature of at least 1-1 hit die every day and The blade is -1 until the 31st casting, when it becomes fully and permanently enchanted .Variants that enchant other weapons could be possible.”
“ Mining in a certain area turns all exposed skin (maybe just parts that are actively disturbing the chemicals that cause the reaction) of the those doing the mining to a dark blue color. Will wear off taking as many years/days spent in the mine. ... meeting a party of blue-skinned humans armed with pick-axes etc. Strange disease? Demon offspring? Curse? If they meet only one ex-worker, they will very carefully listen to any stories he says, no matter if drunken or insane, or just makes up to get a beer.”
“ Carnival revelers wear masks and concealing clothes. (Wearing of masks in Venice was first documented in the late 1200s) It allows for the social classes to mix, easing social tensions.”