Collapse Eternity's End (3.5e Invocation)

Eternity's End is the end of everything, and with its power, your energies detonate into a black void, dragging unfortunates into it.

If applied, this invocation changes your abyssal blast's ranged blast option to target a square instead of another target (requiring an attack against AC 10). If it hits, it explodes outwards into a 20ft-radius emanation, centred on the square that was hit. All creatures and objects in the area are dealt the abyssal blast damage, with a Ref save for half. Additionally, they must make a Fort save or become unable to move by any means (including supernatural or magical means, like teleportation). At the beginning of each affected creature's turn, that creature can attempt a new save, at the original DC, to end the inability to move for itself only.