Champion Shaaaaaaaaards
If I remember correctly, you can get either Champions, Skins, Summoner Icons (not totally sure on that one), or Ward Skins from chests as the primary loot. I own every champion... And I've been getting almost nothing but champion shards.
So I've been hitting the lousiest 25% (maybe 33%) of my chests fairly consistently. I play Fire Emblem and Xcom, so I'm used to how cruel RNGesus can be. I just wanted to vent real quick.
Out of all the chests I've gotten, I've gotten 5 skin shards, 2 ward skin shards, and 12 champion shards.
I only thought I got this unlucky opening things in TF2. T_T