PAX TWISTED FATE ?!?!?!??
Ummmm frist time typing in here but look this is what happen i opened a chest and i got shard pax twisted fate And when i clicked on it it disappeared i tried restarted my game but it just disappeared
Ummmm frist time typing in here but look this is what happen i opened a chest and i got shard pax twisted fate And when i clicked on it it disappeared i tried restarted my game but it just disappeared
Oh by the way i can see pax twisted fate in my twisted fate character not unlocked

This sounds like something that belongs in report-a-bug. You lost a chest and key without keeping the reward.
PAX Twisted Fate, along with all other PAX skins, were convention exclusives, and never ever set to become available otherwise. This was a bug, and you need to report it - but don't expect or hope to get the skin shard.
You can not obtain PAX Twisted Fate in hextech loot. It was most likely a bug, so you should try to contact the support and ask what's wrong if you didn't get something out of your hextech chest.