Haltija
A haltija (haltia) is a spirit, gnome, or elf-like creature in Finnish mythology that guards, helps, or protects something or somebody. The word is possibly derived from the Gothic "haltijar", which referred to the original settler of a homestead—although this is not the only possible etymology. It can also be derived from the Finnish verb "hallita", which means 'to rule', 'to command', 'to master'. The word is also used in modern Finnish to mean, depending on the context, holder, occupant, lord, master, owner-occupier, occupier, possessor, bearer, or owner. There are many different kinds of haltijas. There  are, for example water haltijas and forest haltijas. Even graveyards have their own haltijas ("kalman väki", "death folk"). Human settlements also have haltijas. One type is the tonttu or maan haltija (land haltija). The tonttu is the Finnish version of the Swedish tomte. The Finnish tonttu and the Swedish tomte are related to the words "tontti" (Finnish) and "tomt" (Swedish), which both mean building lot and building site. (Later, such local spirits are also referred to as a "tomtegubbe" ["old man of the homestead"] in Swedish). The kotihaltija (home elf, home gnome) is the tonttu who lives in every home . He takes care of the house, and it is important to treat him with respect. The saunatonttu lives in the sauna and protects it but also makes sure that people do not behave improperly in it. "Joulutonttu" is Finnish for Christmas elf. Unlike the Christmas elves in some countries, the Finnish joulutonttu doesn't have pointy ears. There are even personal haltijas, which are protective spirits that are part of the plural human soul in Finno-Ugric animism. Haltijas are not like Christian angels, but have some resemblances to other spirit guide type forces found in indigenous folklore worldwide. In  Estonian mythology a similar being is called "haldjas", whereas the term used in Estonian for a holder, master, or owner-occupier is "haldaja". Haltija is sometimes written as "haltia". Nowadays this more old-fashioned spelling often refers to the elves in Tolkien's books or other fantasy literature. Folk and power. Some haltijas are divided into races or folks, which are called väki. "Väki" is a polysemic term, and has been used in multiple conflicting meanings, and assigning only one definition to it is not consistent with the source material. "Väki" means either "strength/power" or "group/corps (of people )" (e.g. "väkiviina" "strong liquor" vs. "sotaväki" "the military"), of which the meaning of "power" is etymologically older. The meaning of "väki" meaning "folk" is the result of the anthropomorphication of abstract concepts like "kalman väki", "the power of dead spirits". It does not constitute a separate supernatural force like mana, but is a generic concept for "potency" or "power", including and not separately distinguishing magical potency. There are different kind of väkis of haltijas, like "veden väki" (water folk) or "metsän väki" (forest folk). In this context, the word "väki" can refer to them as a folk, their magical powers , or usually both at the same time. For example, if someone gets sick while swimming, this could be caused by "väki" of water that become attached to a person. In this sense "väki" is more like a magical power emanating from water that can make people ill, but it can also mean that "haltijas" (spirits) are attached to a person. In comparison, if someone goes fishing, they can ask for "väki" of water to bring fish by calling individual "haltijas" belonging to that "väki" by their names, wherein "väki" is understood more as a folk. Some väkis of haltijas: Haltija  väkis of different environments and materials were thought to be in conflict with each other. For example, when wood is burned, it is an assault in which väki of fire is beating väki of wood. Väki of fire can be used to scare other väki away. For example, if you were made ill by väki of water, that attached to you while you were swimming, this väki and the illness could be removed in sauna, which had many väki of fire.