Concentration (D&D skill)

Unofficial rules compendium

Casting Aggressively

This is a variant of defensive casting, where you try to avoid taking attacks of opportunity, but you'd rather risk an attack of opportunity than waste the spell. Casting aggressively has a DC of 25 + Spell Level, and failure indicates you trigger attacks of opportunity for casting the spell. Successful attacks might force you to make further Concentration checks to cast the spell.

Maintaining Spells

With the Recharge Magic system, a spellcaster can maintain a large number of spells with a duration by constantly re-casting them. Since this is an optional rule, details are given under the option, but it uses the Concentration skill.

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