https://www.youtube.com/watch?v=9Ku49GHHKGE&feature=youtu.be
be sure to like and share this FAST before it is patched!!!
Splicer Keys are used for 3 things we currently know of(please correct me if wrong).
You need one to start the Gjallarhorn quest while on patrol in Plaguelands
To get back into the Archon Forge Arena when you die, you will use a key to get back in
There are secret locations on patrol Plaguelands that you can go to and use this key to open chests(after killing enemies in the area).
EDIT: You can hold 10 keys per character and 10 in your vault, for a total of 40!!!
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Kind of off topic,but does anyone know if the Shiro Bounties rotate everyday or if there are a once a week type of thing? I haven't been paying much attention.