Barrier

You create force barrier which have 10 + 3d10 hit points and have AC of 13. Barrier stays in place for it's time duration, until dispeled or drop to 0 hit points. It's 15 ft. wide and have 5 ft. barries on edge. You can cast spells and do range atacks through barrier. You can move barrier by 30 ft. using bonus action. Enemies going through barrier must make strength saveing throw equal you Spell save DC, or will be  pushed back by 5 ft. , lost rest of it's movement and take 3d4 force damage.(It can still take action after fail save)

Barrier consumes gem you use for casting which gives color for it's energy, ruby for red, saphire for blue etc.

1d10 more hit points and 1d4 more  damage for higher spell slot level