A spellcaster can learn a spell during a fight. If the enemy is using a spell, the PC can try to understand its casting. Attempting to understand a magic during a fight requires a reaction for Intelligence (Arcana) check. In this check the DC is 20 + the number of levels this spell is higher/lower than the spellcaster’s highest slot.
For example:
Wizard with 4th level spell slots as the highest, can try to
learn 5th level spell cast in combat with DC 21 Intelligence (Arcana) check,
or 3rd level spell cast in combat with DC 19 Intelligence (Arcana) check.
After the spellcaster learns all the components (V, S, M), and writes them
down into a scroll, the spellcaster will own a scroll containing the spell he
learned. The scroll functions like any other scroll.
- Learning a component (V, S, M): DC = 20 + Spell’s original slot – Highest spell slot of the PC Intelligence (Arcana) check; can be attempted as reaction each time a spell is cast during combat.
- Each successful check will grant one component of the spell.
- After learning all the components, the spell can be written into a scroll.
- Any class can attempt to learn the components of any spell that belongs to any
class (Not limited to a specific class).Information about the components can be shared between the group.
- The PC must write down what they learned immediately after the fight (or during the fight if they wish), otherwise it will be forgotten.
- Multiple components can be learned in a single fight by a single character.