Some spells require Focus, which requires the caster remain stationary, be unable to take any other action, and must remain conscious to keep the effect of the spell active. Spells that require focus can be broken in the following ways:
At will.
When the caster takes any other action including movement, defending, or interacting with an object or environment..
When the caster takes damage and fails a contested Intelligence roll to maintain the spell.
If the caster gains the Unconscious condition.