A quagmire (from "quake" + "mire") is, literally, shaky, miry ground; as a political term used to describe a foreign military campaign in which there is either no foreseeable possibility of victory or the objectives are unclearly defined, and at the same time no clear exit strategy has been formulated in the absence of victory. The military campaign is likened to a kind of swamp or marsh in which the warring nation is unable to remove itself.
en.wikipedia.org/wiki/Quagmire
Does anyone else wonder how they can choose such fitting words for spells? I don't know what the spell does, but the name alone gives many hints of the direction, and with the other changes (swamp affecting battles; maybe other terrains are already implemented?) this could be
very interesting spell...