Spell Coup de Grace

You have mastered ranged spell attacks when the enemy is most vulnerable. You gain the following benefits:

• Attacking at long range doesn't impose disadvantage on your ranged spell attack rolls.
• Your ranged spell attacks ignore half cover and three-quarters cover.
• Before you make an attack with a ranged spell against a bloodied creature, you can choose to take a -5 penalty to the attack roll, or use only half of your Spell Attack Bonus, rounded DOWN (whichever creates the larger penalty).
• If the attack hits, you add +10 to the attack's damage.
  
  
• Using this ability leaves the caster vulnerable. The next attack made against you has advantage until the start of your next turn.