the user made a deal with a devil and now they gained the ability to store weapons in their spell focus and cancel magic

Weapon Grimoire

Beginning when you choose this archetype at 3rd level, you can store 1 Weapon within your spell focus with the heavy and Two-handed properties also it gains the effect of a 7th level Dispel magic but it needs to touch the creature, object, or magical effect

at 5th level, you can store 1 weapon with the light and finesse properties within your spell focus also it gains the effect if it touchs a creature, object, or magical effect that is affacted by a spell store that spell within the weapon then as a action you can cast the spell without nedding the components

at 8th level, you can store another weapon with the light and finesse properties within your spell focus also it gains the effect whenever you hit a creature with an attack. Then that creature cannot use reactions or bonus actions until the start of the users turn

at 10th level, you can store 1 weapon within your spell focus with the versatile propertie also it does an extra 2d6 Necrotic damage

Ki

Starting at 7th level, you can use your bonus action to cast detect Evil and Good and Detect Magic

In addition, you gain +1 Ac

magical anti defence

At 10th level, you gain resistance magical attacks.

Black demon form

Starting at 15th level, you can spend 1 action to gain a flying speed of 30ft you also gain 15 temporary Hit points and you deal an additional 1d6 with weapon attacks for the next 60 seconds. Also your apperence changes you gain horns wings tail and also your type changes to fiend.

anti spell defence

At 18th level, you gain resistance to spells.