Creeping frost

A slippery layer of frost coats the ground and turns it into difficult terrain for the duration of the spell. This spell can take the form of a 10 by 10 feet square or alternatively a straight line (either horizontal or vertical) of up to 4 5 feet squares.

When the ice appears, each creature standing in its area must succeed on a Dexterity saving throw or fall prone and take 1d4 bludgeonning damage. A creature that enters the area or starts/ends its turn there must also succeed on a Dexterity saving throw or be affected.

NOTE: If a fire is situated next to an affected square the ice will thaw after one turn. As a result it also can't be cast in squares next to existing fires or sources of sufficient heat that could melt the ice.