Halberd Master

With extensive practice you have mastered the art of fighting with a halberd, granting you the following benefits:

• Increase your Strength or Constitution by 1, to a maximum of 20.
• When you hit a creature with a melee weapon attack, you can deal an extra 1d10 slashing damage, if the attack was made with a halberd. Once you deal this damage you can't deal it again until the start of your next turn, unless the attack scored a critical hit.
• Your weapon attacks, made with a halberd, score a critical hit on a roll of 19 or 20.