Demiurge

The caster holds their hands in front of them and speaks the keyword, causing the outline of a red cube to form in front of them, up to 150 feet in any direction. Inside this cube, the caster can cause one of the following effects to occur:

Shambles: The caster chooses up to 12 objects, creatures, or cubes of space no more than 10 feet in dimension and switches their place with the other 12 items. Creatures can choose to make a Constitution save with disadvantage and be unaffected.

Biome: The caster alters the terrain type and weather of the area inside the cube. They can choose to change the terrain to Arctic, Forest, Desert, Mountain, or Underdark. If Arctic is chosen, then clouds will form within the cube and begin snowing heavily, and the temperature immediately changes to 5 degrees Fahrenheit, and can be changed to -10 if the caster wishes. If Forest is chosen, the ground within the cube will change to fertile ground with lush grass, regardless of previous condition, and 2d8-1 trees will emerge from the ground in locations decided by the caster over the course of one round. If Desert is chosen, then the ground transforms into coarse sand, and all freestanding water evaporates over the course of 1d4 turns. Additionally, the sunlight within the cube intensifies, and all Undead or Fiend creatures must make a DC 14 Con save or take 2d8 radiant damage. If Mountain is chosen, then the ground becomes rocky and barren, terrain becomes Difficult, and stone outcroppings jut out of the ground. All creatures within the cube must make a DC 14 Dex save or be knocked Prone. If Underdark is chosen, the entire cube is shrouded in extreme darkness, and all lights within it are doused. These lights can be relit, however the range of their light is halved, as is the range of any creatures' dark vision.

Emergence: If chosen, this effect causes various objects to jut out from the walls of the cube. These are limited to Stone Spike, Flame Pillar, Eldrich Arm, and Web Chain. The movement and area of appearance of all of these objects can be freely controlled by the caster. Only one variant of this effect can be active at a time. If Stone Spike is chosen, then spears of stone will quickly emerge from the sides of the cube, jabbing at up to 4 targets per turn before returning to the sides of the cube. Each target must make a DC 17 Dex save or take 10d8+10 piercing damage. If all four spikes are focused on a single target, the damage doubles. If Flame Pillar is chosen, then a large column made of fire will erupt from the bottom cube side, before growing up to meet the ceiling. The pillar deals 10d8+10 fire damage to any creature caught in the pillar's conjugation, and 3d8+3 fire damage to up to 4 creatures within the cube, sending beams of flame flying at them. If Eldrich Arm is chosen, four giant humanoid arms emerge from sides of the cube and attempt to mindlessly attack all creatures within the cube, using claws to slash at them, dealing 8d8+10 slashing damage on a hit. Finally, if Web Chain is chosen, then innumerable strands of a white glowing thread cover the interior of the cube, Restraining all creatures within it. These threads cannot be damaged by non-magical weapons, but can be burned, although they regrow in 1d4-1 turns.

The effects of this spell can only be used on creatures who are inside the area of the cube when it was cast. Any creature other than the caster who attempts to enter the cube after it has been cast must succeed a DC 22 Con save or be denied entry, the walls acting as force fields. Likewise, any creature attempting to exit the cube once in it must succeed a DC 22 Con save in order to do so. The caster may enter and exit the cube at will, being unaffected by any negative effects active within the cube at the time, however they must have at least one hand on the wall of the cube in order to control anything within it.