Each battle pet has 3 available ability slots that open up at levels 1, 2 and 4. At levels 10, 15, and 20, a secondary ability becomes available for each of their slots. This allows some battle pets to be able to chain their own abilities together, using one ability to set up another to deal an additional effect. Or they can be used to complement the team by changing the … [Read more...] about Stacking Battle Pet Abilities