As the title sez, is it possible (and ofcourse how is the question) to combine 2 abilities in one. Here's an example - take Blizzard for instance. Can I add a slowing effect to the already damage in area ability so when I cast blizzard, it will not only damage the units but also slow them down for some time. And while we are at it, how is it possible to make a single target spell become aoe, like sleep - is it possible to make it aoe so it affects not just 1 target at a time?