Somaria (spell)

3-point conjuration
Casting time:	1 action
Range:	10 feet
Components:	S, M (an iron cube one inch in diameter)
Duration:	1 minute

You create a Medium stone block in a 5-foot cube of open space in range. The block lasts for the duration. As an object, the block has AC 17, has 20 heart points, and weighs 500 pounds. If you cast this spell again, a new block is created and the previous one abruptly vanishes. You can use your bonus action to instantly destroy the block.
     If the block is destroyed either by your bonus action or by losing all its heart points, it erupts with bolts of flame that scatter in a cross pattern. Any creature in a 120-foot line directly north, east, west, and south of the destroyed block must succeed on a Dexterity save or take 3d10 fire damage.
     Upcast. You can upcast this spell by expending extra magic points when you cast it.  For every 3 extra points expended, the damage increases by 1d10, the dimensions of the block increase by 5 feet, and its weight doubles.