With the new addition of _Runes Reforged_ coming into League within the next patch I was looking at other parts of League too which could also do with some updating. One of the reasons why Riot wanted to get rid of the old runes system is the fact that it isn't creative and it was just raw stats and wasn't really anything to mess with once you found your optimal page.
With this in mind I feel like the benefits for slaying a drake should be more impactful and rewarding than just a simple stat boost, regen or bonus damage to objectives. In addition to this drakes in particular aren't as prioritises as they should be and the rewards that come from these drakes are very one/two sided (cough mountain and infernal drake) where as others like the Wind Drake are practically useless. I would also love to here **your**ideas as to what you think drakes benefits should be if they ever got reworked!
Here is an idea I had for each of the 4 drakes in league:
Infernal - For the first 2 seconds in combat your damaging spells and attacks will burn enemies for 2/3/4/5/6% of their maximum health over 2 seconds; stacking up to 2 times on one target.
Mountain - For the first 2 seconds in combat you and your allies gain 10/15/20/25/30 increased Armour and Magic Resist.
Ocean - Upon entering combat you and all allies within a 400 range of you gain a 100/150/200/250/300 health shield which decays over 2.5 seconds. Has a 10 second cooldown per shielded ally.
Wind - For the first 2 seconds in combat you gain 10/15/20/25/30% slow tenacity and your movement speed buffing durations are increased by 10/15/20/25/30%.
Just a quick little idea and yes some of these probably aren't balanced to begin with but it is to get an idea as to what I think that the drakes benefits should be. And to compensate for these big changes to their passives I feel like they should be harder to kill as the benefits are more rewarding/impactful.