You’ve learned to put the weight of a weapon to your advantage, letting its momentum empower your strikes. You gain the following benefits: (1) On your turn, when you score a critical hit with a melee weapon or reduce a creature to 0 hit points with one, you can make one melee weapon attack as a bonus action. (2) Before you make a melee attack with a heavy weapon that you are proficient with, you can choose to take a -5 penalty to the attack roll. If the attack hits, you add +10 to the attack’s damage.
Prerequisite: The ability to cast at least one spell. You have practiced casting spells in the midst of combat, learning techniques that grant you the following benefits: (1) You have advantage on Constitution saving throws that you make to maintain your concentration on a spell when you take damage. (2) You can perform the somatic components of spells even when you have weapons or a shield in one or both hands. (3) When a hostile creature's movement provokes an opportunity attack from you, you can use your reaction to cast a spell at the creature, rather than making an opportunity attack. The spell must have a casting time of 1 action and must target only that creature.