There was a bug/exploit where at certain pixels in fountain you could cast abilities and they would apply globally.
Best explanation/demonstration I can recommend is done by @
Kaizen on Youtube.
To get into the glitch you used hexflash into a small portion of the shop or found the pixel w/o the hexflash (which is why hexflash was temporarily disabled)
The easiest was kayn, as you didn't need hexflash, just the pixel, and his w did the most damage, so he was also temporarily disabled.
I've tested all champs via the old method that was used on Kayn + Poppy, however I definitely believe it to be patched in the small update released a few days ago (100 MB). I'll try my best to come up w/ something similar, but I'd say the chances of me getting something similar to this are extremely low (if not impossible).
To @
angels2a
As far as I am aware, this currently is disabled/patched and can no longer work on live servers, so it can not be tested.
To answer @
quesopeso
You can do this via exploit or by scripts, scripts definitely make it easier to find the certain pixels as they are programmed to do it. However, this bug/exploit should be patched? If you send me your replay I may be able to re-create it and make a guide, however if it is how I think it is done, it should be patched.
It is quite possible that Garena servers still can do this because of later updates and the fact riot doesn't specifically own the servers they are on, therefore it is harder for them to push updates.