You can cast spells with total detachment from your body's condition.

Prerequisites: Still Spell.

Benefit(s): When you cast a spell augmented with Still Spell, you do not need to make a concentration check as a result of any physical disruption, including movement (such as riding a horse or being on the deck of a storm-tossed ship), being grappled or pinned, or even being injured while casting.

Alternatively, you may expend a use of mythic power to cast a spell as a still spell (gaining only the normal benefits of a still spell, rather than the increased benefits outlined above) without preparing it as still in advance, taking extra casting time, or increasing the level of spell slot it uses.

Special: A still spell requires no somatic components.