I found a few things which should be added to the slayer of demons profile.
1. Is curse manipulation as there is a magic spell called curse sword, which states it puts a curse on your weapon. It also seems to amplify the weapons strenght, so maybe static Amplification is also something which should be added
https://demonssouls.wiki.fextralife.com/Curse+Weapon
2.damage reduction via the spell warding, which reduces Physical damage taken by 70%
https://demonssouls.wiki.fextralife.com/Warding
3.nullification via anti-magic field. The name explains it all it nullifies magic in a certain area
https://demonssouls.wiki.fextralife.com/Anti-Magic+Field
4. Next up is battle field removal or bfr, via banish, this Miracle can banish black phantoms to their own world
https://demonssouls.wiki.fextralife.com/Banish
5.teleportation via evacuate which sounds you back to the nexus
https://demonssouls.wiki.fextralife.com/Evacuate
6. Resurrection, yes i know they already have it via the nexus but they should also have it via second change which brings back the caster right away.
https://demonssouls.wiki.fextralife.com/Second+Chance
7.static Amplification via clever rats ring which increases attacks by 50% when health is at 30%
https://demonssouls.wiki.fextralife.com/Clever+Rat's+Ring theres also the dull rats ring which increases defence by 50% when health is at 30%
https://demonssouls.wiki.fextralife.com/Dull+Rat's+Ring