Bad Advice: you gain the guidance cantrip, but it triggers on a success, and gives a penaltyThere should be some invocations to enhance other cantrips.
Conversation Casting: You learn to weave arcane words and gestures into the middle of a seemingly normal conversation. You must be talking and concentrating for at least 1 minute, after which you cast a spell and make a Deception roll. If you succeed against a creatures passive insight, they do not know you cast the spell. Spell effects such as rays or bolts are hidden, but still requires line of sight.I'd suggest some of those alternatives should be less overtly magical. A lot of the flavor and class design for Warlocks suggest a tendency to be more subtle with their magic use than WIzards or Sorcerers, so they should have some options for their default attack that lean into that.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.