Cap 229: Nix
In order to release the soul of this Spirit Dragon I could use my abilities, but what I really wanted to do is use this Dungeon Core to be the core of this Spirit, for that I have to link this core directly with the soul of this Spirit.
I use my non-elemental magic to make the dungeon core and the black crystal float in front of me, then take my dagger and cut my hand, I control my blood and cause a great deal of blood to come out of my body and float like a big one Blood sphere in front of me, so I use my ability to heal myself and drink a blood-replacement potion, I asked Lyra to make several of this potion two days ago when I knew it existed.
After drinking the potion I feel a little better, so I make the core and crystal go inside my blood sphere, after that I activate all Aura abilities that landed, also activate Blood Servant and Vampire Servant abilities.