HGd10PHB - Spell Purpose - Defense

Defense - Spell Purpose
This type of spell is somewhat related to aid, but it is specifically related to spells that protect against things, especially Attack spells. Because of their nature, Defense Spells are particularly fast in their casting. A spellcaster may cast a Defense Spell in response to an Attack Spell or Skill if all of the following conditions are met: If the defender meets all these criteria, they may cast the Defense Spell and use that check as the opposing check against the Attack Spell instead of standard Defensive Skills or Resistance.
 * They act the same Turn or no more than 2 seconds (Game Turns) after the attacker.
 * They have not used their action for the above Turn yet. (See Special Combat Rules for declaring attacks and initiative).
 * They succeed at a Sense Check with a DS equal to 10 + their opponents AGL.
 * They succeed at a KNW: Mysticism vs the Spell Check of the opponent. (They can still try a defensive spell if they fail this check, but succeeding allows them to correctly identify the spell being cast and chose accordingly.)

Primary Characteristic - Constitution or Agility

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