League-of-legends – What are Zyra’s 3 hidden passives

Okay, from my experiments, it goes:

Armor/MR reductions <--> Percentage Reductions
(They stack multiplicatively, so order is irrelevant)

Flat Reductions

This makes sense, since if flat reduction was the first thing applied, after armor, it may have failed to provide a benefit at all (since, for instance, the difference between 50 * 27% and 48 * 27% is minute at best. 50 and 27% being the base attack damage of Ezreal and the armor of Amumu, my two test characters.)

Shields act as health, and damage done to shields is likewise reduced by armor / magic resist. (Meaning shields on tanks can generally absorb more punishment than shields on squishies)

Sunlight: Leona's passive Sunlight deals one less damage to champion skins wearing sunglasses (eg. Surfer Singed and the Commando skins).

Source: http://leagueoflegends.wikia.com/wiki/Hidden_passive

Here is a link to the LOL files, where the information of the wiki comes.

Another source, is a video of Rift Myths:

NOTE: There is a bug in Jarvan's Commando skin and he do not receive less damage.