Swamp hill

A mist of dark green ash sprays into the air covering a dome of 30ft. as the ash touches the ground the outside is immediately covered in a glassy deep green wall of force. The inside of the bubble is distored like looking into a funhouse mirror. The force wall is Surrounded in a harmless Bright green flame. Light radiating 10 ft. and dimlight an additional 10 ft. 

On coming into contact with the glassy wall of force the Target must make a save Dc Of 8+proficiency+spell level. Otherwise be drawn into an extradimensional space with a 90 ft radius. The inside of the dome is riddled with magical terrain of sharp jutted coal, and stone making it difficult terrain. The dome takes its turn with a minus 5 innitative of the caster. Much like a lair it make take one of three actions and can not repeat an action on its next turn. 

Lair actions.

the dome can be moved instantaneously 60 ft in any direction, creatures inside may make a strength saving throw to anchoring themselves to the ground to remain. Otherwise they are moved with  the dome.

The lair creates a thick blanket of ash, or fog. The lair remains obscured for a number of turns equal the level of the cast. the ash or fog on ignition causes a fast burning reaction. all targets suffer 5 flat fire damage with no save.

Magic surge-The area pulses changing the elemental damage type of the spell.

Dragon prayer- The charged elemental energy can be called by all friendly to the caster. On a bonus action add a d4+caster Level to one melee attack.

Marked hunt- Inside the lair all friendly creatures may use a bonus action to ignore the resistance of creatures using a bonus action to coat their weapon in a reath of magic. 

at 2nd level the dice used for damage is a d4, increasing the die size every second level by one category. 4d, d6, d8, d10.

 level upcasted the spell doubles in both radius 2nd 30 ft, 6th 60 ft , 9th 120 ft

every 2nd level upcasted doubles the duration of the spell. 

If cast at 6th lv in one place for an entire year the Laor becomes permanent and can not be moved only dispelled.