You can't act contrary to your design. (R) Psychic.
(Concentration) When you roll Initiative, separate the map into 3x3x3 sections in a grid; if a wall would move through a creature you decide which side they end up on unless they succeed a DC 19 DEX save. Teleportation is impossible for enemies within the grid.
A section of grid wall can be destroyed with a DC 19 Arcana, Examination or Might check (1 action).
(1/Round) When a spell is cast, nullify it.
- •Shift Grid.
Remove or remake up to three walls in the grid. THEN:
- •(2x) Pincer.1d20+15.
On hit: Grappled. OR:
- •Displace.2d20+20.
(Range 12; ignore grid barriers) DC 19 INT save or teleported to a different grid.
The leaders of the modron armies, hexaton use their ability to section off the battlefield to effectively isolate their enemies and dispatch of them with the cold and calculated efficiency of Mechanus.