Well I thought about making it add damage to undead by anyone wielding it, but then it'd just become some sort of "undead-bane" weapon. Instead, it's a weapon usable by rogue-types to enhance undead combating abilities, all in the name and glory of the sun god. Go to Comment
Another real world thing. White tea. Can only be picked two days a year, the two days before the flowers blossom. Could be a similiar plant that...is the deadliest poison known, cure known diseases or psychosis, or a potent herb that just tastes awesome.