How do you unlock the new characters and weapons in Mass Effect 3's DLC packs? I've seen plenty of other people playing with them, and I can see the new characters greyed out in the selection menu, but after buying a ton of those annoying random loot packs I haven't unlocked even one.
Are these only found in the 99k packs? If so how many of those packs do I have to save up for to get even one to turn up?
Do you have to play a particular game type? Does having existing characters up to a certain level help?