Divine Metamagic Persistent Spell help

[Nosta]

I am at a lost as what buff spell I should use to boost my crusader/cleric

as a note: I have a hombrew weapon that can reduce the cost of a spell level or metamagic by 5

the character is level 18

[PseudoPanda]

Ok Character Level 18, how many cleric levels and how many crusader/other class levels? What books are allowed? How does your DM feel about reach/occular spell to make other spells persistable and if you can are you utilizing that? What domains do you have? Does the party need anything from you?

The more information the better. From PHB, Divine Power is a main go to along with Divine favor. The Cloak of chaos line of spells are good to have on your party, though most of the benefits will probably be covered by their gear. Righteous Might is good if your DM doesn't throw a lot of narrow hallways (mine always do). Miracle can also be used to cast almost any other spell that qualifies for persist.

This is a good source for other spells, though it includes non-cleric spells