~~~~~Everyones character is an Immortal.~~~~~
Age, Nature, Mortal/NPC's, Non-Magic Attacks Can't kill you!
Magic Weapons (Almost everyones weapon) Spells/Artes, or another Immortal Can kill you!
You can choose to be a mortal, the down side would be you die easier. Immortals are born from Mortals, the difference between them is the soul's input and output of magic energy/ "Aer" is much more intense than Mortals and helps their Physical live longer.
Aer is the short term for "Magic Energy"
Story Line
The Cruix Angels are trying to take over the World Tree "Yddgrasial" for themselves. The need A Hermes Blastia to control the output of Aer. The need the Key of Lorelei to fuse two swords together. The Eternal sword and Deis Nomos fused together can handle using Yddgrasial's Aer output, connected with a Hermes Blastia, the amount of Aer can be conntrolled by the weilder. All of these tools together can give the Cruix Angels unlimited power. The site owner "Hikari Ichirin-Nohana" is the New Leader of the Cruix Angels and is searching for these keys items to control the worlds. Hikari Ichirin-Nohana brought the worlds together in order to find all the peices to the puzzle and plans on ruling them all.