(Elise Buff) If Elise lands a Cocoon, allow her to access the bonus effects.
Simply put. Reward Elise players for successfully landing her E by giving her the damage/heal buff upfront instead of on her only disengage tool. It may sound a little broken, but think about it: Elise needs more damage to kill people. Give her the damage ahead of time so she has a better time trying to assassinate the carry, rappel out, then reset. If it's broken you can always nerf her Human E cooldown/bonus effects, but I really think this would be a good change for Elise.
Alternatively, what if this only happened once she hit lvl 6? That way she wouldn't be able to destroy someone until lvl 6 without some help, like Ahri or LeBlanc (Assuming their target isn't low to begin with).
Currently Elise's bonus effect is this: http://2.bp.blogspot.com/--uooXUPmF9U/VXtQnTECxjI/AAAAAAAAraU/8CRzXanoegY/s640/ererer.jpg
Sorry if the poll is a bit long, but I think having more options is better in this scenario.