I've always felt the spell once per day invocations ('Bewitching Whispers', 'Dreadful Word', 'Minions of Chaos', 'Mire the Mind', 'Sculptor of Flesh', 'Sign of Ill Omen', and 'Thief of Five Fates') are all very weak. A single free casting of a single spell doesn't feel worthwhile, and many of the class guides for warlock appear to agree.
My proposed house rule is this: For each of these invocations, your warlock patron automatically maintains concentration on your behalf. This means that you do not need to concentrate on the spell, but your patron only maintains one such spell for you at a time. I know several players would probably consider these invocations if it meant they could pair the spell with "hex" or other spell. Moreover, I think it's a great way for the mechanics to support the story. The fact that the warlock can occasionally maintain two spells at once is a good reminder of the fact that the warlock draws its power from someone else.
Thoughts?
My proposed house rule is this: For each of these invocations, your warlock patron automatically maintains concentration on your behalf. This means that you do not need to concentrate on the spell, but your patron only maintains one such spell for you at a time. I know several players would probably consider these invocations if it meant they could pair the spell with "hex" or other spell. Moreover, I think it's a great way for the mechanics to support the story. The fact that the warlock can occasionally maintain two spells at once is a good reminder of the fact that the warlock draws its power from someone else.
Thoughts?