Vigor Free-To-Play Shoot 'n' Loot Game

To cast one of your warlock spells of 1st level or higher, you must expend a spell slot Fiendish Vigor You can cast false life on yourself at will as

Part of the question still remains, does fiendish vigor allow you to cast it with a higher spell slot without expending it? EDIT 2: as

slot win 168 A maximum of one Arcane can be equipped on all weapons, while Zaw and Kitgun Arcanes occupy a unique slot separate from PrimarySecondaryMelee Arcanes

slot 2022 As a PvEer, I'll tell you that my chars who slot Vigor do so to help those allies around and that is really the only draw of Vigor No AoE