So what else can our locationGenerator describe? How about a magical disturbance. This could be a number of things, from portals to fog to odd smells.

During your travels, you stumble across a magical disturbance. You [see/feel/taste/sense/smell/hear] something [strange/unique/powerful]. Ahead of you there is a [colorless/invisible/colorful/red] [portal/cloud/shadow]  [floating overhead/ hovering over the ground]. The disturbance fills you with feelings of [uneasiness/joy/revulsion], and yet you find yourself [attracted/repelled] by it.