A Stellium is made up of five or more planets in a house or sign. When a large group of planets are all together in one area, they all receive major transits within a short amount of time. If the transit is a good one, then all goes well, but if it is difficult, then this can bring a long spell of difficulties. In a natal chart, with half the planets involved, major transits can bring extreme reversals and have a life changing impact on a person. Therefore, a Stellium in an angular house portends great changes of fortune, with the good and the bad coming in patches. There are periods of success and recognition, which may be followed by a severe fall. A fall is followed by an amazing come back, and so on. There can be many of these ups and downs throughout life.