Expanded Warlock's Concentration

After much mental and physical training in expanding your concentration while holding a curse on an enemy, you gain the following benefits:

• Increase your Constitution score by 1.
• While concentrating on the Hex spell, you can simultaneously concentrate on a different concentration spell from the Warlock Spell List that does not deal damage.
• If you lose concentration, you choose whether you lose concentration on Hex or the other Warlock spell.