MechaTarrasque
Hero
Jeremy Crawford talks a little about familiars from the spell and "Befriend a monster that has variant rules for being a familiar" at https://www.sageadvice.eu/2018/10/04/want-a-magical-familiar-in-dd-there-are-2-ways/.
Nothing too new, but it seems like the "why doesn't my warlock automatically get the variant familiar?" pops up occasionally.
Highlights include:
Want a magical familiar in D&D? There are 2 ways:
1. Cast the find familiar spell. It summons a spirit that takes on a form. The list of possible forms is larger if you're a warlock with Pact of the Chain.
2. Befriend a monster that has variant rules for being a familiar.
....
If a monster has a variant rule for being a spellcaster's familiar, that variant is in the monster book that contains the critter. For examples, check out the pseudodragon and the quasit in the "Monster Manual."
Those variants have no bearing on the find familiar spell.
.....
and in response to "Making a Celestial warlock have a celestial imp doesn't make that option any more thematically fitting, though."
If you don't think a combination is thematically appropriate for your character, I recommend you avoid that combination.
I will say that if you put a baby ki-rin familiar on the cover of XGtE (confirmed here, https://www.sageadvice.eu/2018/01/24/what-is-the-familiar-sitting-on-the-war-mages-shoulder/), they ought to have statted one up.
Nothing too new, but it seems like the "why doesn't my warlock automatically get the variant familiar?" pops up occasionally.
Highlights include:
Want a magical familiar in D&D? There are 2 ways:
1. Cast the find familiar spell. It summons a spirit that takes on a form. The list of possible forms is larger if you're a warlock with Pact of the Chain.
2. Befriend a monster that has variant rules for being a familiar.
....
If a monster has a variant rule for being a spellcaster's familiar, that variant is in the monster book that contains the critter. For examples, check out the pseudodragon and the quasit in the "Monster Manual."
Those variants have no bearing on the find familiar spell.
.....
and in response to "Making a Celestial warlock have a celestial imp doesn't make that option any more thematically fitting, though."
If you don't think a combination is thematically appropriate for your character, I recommend you avoid that combination.
I will say that if you put a baby ki-rin familiar on the cover of XGtE (confirmed here, https://www.sageadvice.eu/2018/01/24/what-is-the-familiar-sitting-on-the-war-mages-shoulder/), they ought to have statted one up.