Counter-Spell

Upon casting the spell you may conjure a stone counter-top in a space you can see within 30ft. When summoned the counter-top can provide three-quarters cover (+5 AC and Dexterity Saving Throws) for a single creature or half cover (+2 AC and Dexterity Saving Throws) for two adjacent creatures. The counter-top has 18 HP and 15 AC. It is also possible to intercept projectiles, including spell effects with a successful skill check. 

The counter-top may also be summoned in the air over a target creature. Summoned at 10ft, the target creature must make a Dexterity Saving Throw (DC 16) or take 1d6 damage. If summoned higher at 10ft intervals the damage increases by an additional 1d6 and the DC decreases by 2. The counter begins to drop on the turn it is summoned, not at the end of the round.