It's the flip side of the coin of the Fiend Patron warlock.
My pact of the Tome Celstial Warlock is a joy to play.
Our party has no cleric; she's a dedicated servant of a particular deity/patron who 'heard the call' as it were. It works.
Yep. It is fun to cast wall of fire, and then on the next turns repel various creatures into it with repelling blast, if need be.Thing is, the "thematically appropriate" spells for a celestial warlock are there. In the subclass bonus spells.