Q works by targeting a point and then recasting it on another point near the first one. It's supposed to look like the explosions from a Nautilus ult, except manual. It has a potentially infinite range, as the cast range (after the initial cast) is measured from the position of the previous cast.
W is a wall. Similar to Anivia's but with a formation time so that you can potentially get over it. It also lasts longer and forms in a semicircle which makes it a much more potent trap.
E is a ground AoE that knocks everything away from it's center and leaves a slowing field.
R is an AoE knockup and damage, followed by a delayed AoE knockback in a larger area and more damage. First it knocks you away from it, then it pulls you back.