Liandrys bonus damage should only kick in if the target is slowed at lest by 25%

Right now Rylais only purpose in the game is to enhance Liandry. Removing their combo would give room to actually buff the hp/ap numbers on Rylai, so the champs who buy it for the purpose of kiting (which is its main goal) could benefit from it, but would gimp the retarded "oh Zyra missed his e-r, but the stupid plants still take 20%+ of your hp".