There's this really interesting hidden combo with the amulet of yggdrasil that not many people know about. The basic concept involves filling each slot with enchantments from different realms, making sure you've got one from each of the nine realms in there. Once you do that, you'll unlock this secret nine realms buff that isn't mentioned anywhere in the menus.

The cool part is what it does to your permafrost and immolation abilities when you trigger them with l1 plus triangle. You'll see nine realms pop up on screen, and both those moves get a pretty serious damage boost for a while. Just remember you'll need the fully upgraded amulet first, to have enough slots for all nine realm enchantments.

Not exactly obvious at first, but definitely worth setting up especially when you're taking on tougher fights and need that extra punch with your special moves. The damage boost makes a real difference, and you can keep triggering it as long as you've got the right enchantment setup going.