Killing Systems in the Multiverse (Actual world Dxd)

i want to give my character magic but there are to many good to chose.

like from nasu universe there are like denial of nothingness or the fifth great magic blue it gives everthing the Imagination but in the end its still blue.

or arc of emboidment its like every Imagination is going to be real hassle

i want to do the same as ahinnilittion maker or i kill reincarnator fanfic thats why and i want to start from dxd because there are many fanfic.

So choose between

1.Denial of nothinges

2.Magic blue

3.Arc of emboidment

4.or other magic you like