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Message: <blockquote data-quote="EzekielRaiden" data-source="post: 9808803" data-attributes="member: 6790260">But they don't have those slots. As said, I haven't watched the video. But that could be what he meant, even if he said it poorly or the like. Not having 6th-9th level slots is a significant way in which Warlocks are not the same as full casters.And yes, this does in fact matter mechanically--mostly unhelpful, but occasionally helpful. In 5.5e, you cannot cast more than one spell using a spell slot in a single turn. This means you could cast a bonus action spell with one of your Warlock slots, and also cast one of your Mystic Arcanum spells in the same turn, because the Mystic Arcanum spell does not use a spell slot. However, you can never upcast your lower-level spells beyond 5th level, and you cannot even attempt to upcast any of your Mystic Arcanum spells.This also gives (very, very minor) utility to those otherwise-crappy "you can cast <X spell> once per day without expending a spell slot" invocations, since they theoretically allow you to cast two spells in a single round.</blockquote>