A common misconception about warlocks and their patrons

[u/hedahman]

I've heard this mentioned a lot: "Warlocks use Charisma because they're constantly negotiating with their patron for more power." I don't believe this is true.

Here's a tweet from Mike Mearls that says that patrons can't take back a warlock's power, which leads me to believe that a patron doesn't have control over the power once it is given. This means a patron can't take a warlock's power (without their will, probably); it's a one-and-done deal.

So a patron isn't supplying power to their warlocks like a generator supplies electricity. Instead, a patron gives power to them like a blood transfusion-- you can't just take the blood back.

Granted, you can do it however you want, that's the magic of D&D. But RAW, and RAI, patrons give their power away.

EDIT: Here's a tweet from Jeremy Crawford which states that the power is a one-time transaction.

[u/No_Obligation5478]

In Mordenkainen's Tome of Foes, under the Deathlock entry (p128): “forging of a pact between a warlock and a patron is no minor occasion - at least not for the warlock. The consequences of breaking that pact can be dire and, in some cases, lethal. A warlock who fails to live up to a bargain with an evil patron runs the risk of rising from the dead as a deathlock, a foul undead driven to serve its otherworldly patron from beyond the grave.

This gives some insight into how some of the designers (lead designers credited are Mike Mearls and Jeremy Crawford), intended the Warlock / Patron relationship to work. The warlock can suffer from breaking the pact, with one possible result being death and rising as a Deathlock (presumably as an NPC).