I got the layers thing (how do you handle advantage though? As THAT is the explanation given for the "resitance to magic" of the horror), can we assume "blasting" spells fall under the "half damage" thing for the purpose of the fight?
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Resistances are "layered", meaning that if a character displays the ability to overcome a resistance, it can affect a character with resistance. D&D characters, however, have multiple layers of scaling for their resistance- basically, for every number that they'd add to their roll for a save, they have another layer of resistance- as a number lower would be affected by an ability that they'd be totally immune to. For the purposes of the wiki, we don't use the dice rolling mechanic (due to game mechanics, obviously), so instead we assume a completely average roll of 10.
So a +1 bonus is one layer of resistance, a +2 bonus is two layers, +3 is three, and so on.