Building Power

You call upon your sorcerous power from within you. Your next spell or cantrip cast within the spell's duration is empowered in one of the following ways. This empowerment cannot stack. 

• The spell deals an additional 1d6 force damage (increases to 2d8 at level 11).
• If the spell is ranged, the range increases by 15 feet (increases to 20 feet at level 11).
• When you cast your next spell, you roll a d4. If you roll a 4, all enemies affected by the spell are knocked prone if they fail their save or you successfully hit them (at level 11 all enemies affected are knocked prone if you roll a 3 or 4).

If you do not use a spell by the time the duration of this has expired, you take 1d10 unavoidable necrotic damage. Additionally, if you use this 3 times within a minute (10 rounds) you suffer one point of exhaustion.