While I'm sure it's because it would be a little too much in strength, couldn't it at least work on the first tick, or a reduced effect? I don't get the boost when I use Malz or Swain's E.
Dot effects are neither single nor multiple target spells. They are simply "Damage over time" spells. This is why Rylai's specifies DoT effects in the tooltip.
© 2013 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.