5E Advanced Effects (items, npcs, characters)

[DustyLensCap42]

Thanks so much!

[Hussar]

Ok, I am a dunce and I cannot seem to figure stuff out. I have the following homebrew weapon:

Radiant Soulspear:

Alignment Assualt: When you hit an evil creature it takes an additional 1d6 radiant damage. When you hit a good creature with soulpiercer, the creature has resisatnce to your attack's damage.

How do I code this into the item? I've been beating my head against this for a while and now my nose hurts.