You don't get any experience for the amulet until you get your first valkyrie. It's not well explained, but you'll figure it out by observation. I repeat, you cannot level up viking vortex no matter how often you use, not until you get Christa.
You can, however, start working on the medal that awards troops killed by rage abilities. You have to finish off the stack with the rage ability it for it to count, btw, not just kill a few units in it.
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