Adding new Lores of Magic requires modifying the WFRP4e’s config. You can achieve this using either World Script or Module.

Config data can be found under the game.wfrp4e.config as soon as init hook. There are 4 fields pertaining to the Magic Lores:

• magicLores – holds the names of Magic Lores. key is used to recognize lore programatically and value is displayed label
• magicWind – holds names of Winds linked to a given Lore, where key matches the key of an entry in magicLores and value is the displayed label of the Wind (used for example as specialization in Channelling skill)
• loreEffectDescriptions – holds the descriptions of Lores, where key matches the key of an entry in magicLores and value is string representing HTML that will be appended to the Spell’s description
• loreEffects – holds Object data for Active Effect, where key matches the key of an entry in magicLores

Example: Simple Lore with Description

I want to add a “Lore of Blood Magic”, unrelated to Winds, with simple description and no automation:

Blood Magic spells are forbidden and warp your soul. Every time you kill a target using one of your spells, gain 1 Corruption.

Hooks.once("init", () => {
  const config = {
    magicLores: {},
    loreEffectDescriptions: {},
  };

  config.magicLores["blood-magic"] = "Blood Magic";
  config.loreEffectDescriptions["blood-magic"] = "<p>Blood Magic spells are forbidden and warp your soul. Every time you kill a target using one of your spells, gain 1 Corruption.";

  foundry.utils.mergeObject(game.wfrp4e.config, config);
});

Example: Lore linked with Wind for Channelling, Description and Active Effect

I want to add a “Lore of Ice” that is linked to “Azyr” Wind and has the following effects:

Ice Spells inflicting Damage cause the target to become Chilled for one minute, reducing their Agility by 10 and their Movement by 1 (down to minimum of 3). Target can suffer from only one Chilled Effect at a time.

Hooks.once("init", () => {
  const config = {
    magicLores: {},
    magicWind: {},
    loreEffectDescriptions: {},
    loreEffects: {},
  };

  config.magicLores.ice = "Ice";
  config.magicWind.ice = "Azyr";
  config.loreEffectDescriptions.ice = "<p>Ice Spells inflicting Damage cause the target to become <em>Chilled</em> for one minute, reducing their Agility by 10 and their Movement by 1 (down to minimum of 3). Target can suffer from only one <em>Chilled</em> Effect at a time.</p>";

  config.loreEffects.ice = {
    name: "Chilled",
    img: "icons/magic/water/ice-crystal-white.webp",
    duration: {
      seconds: 60
    },
    system: {
      transferData: {
        type: "target"
      },
      scriptData: [
        {
          label: "@effect.name",
          trigger: "prePrepareData",
          script: `
            args.actor.system.characteristics.ag.modifier -= 10;
            
            if (args.actor.system.details.move.value > 3)
              args.actor.system.details.move.value -= 1;
          `
        }
      ]
    }
  };

  foundry.utils.mergeObject(game.wfrp4e.config, config);
});