Implore

First off, summoning a 'Fist of Odin' is a 6th level spell, so you'll be able to cast it a long time from now, when you're 11th level. To put things in perspective, you need a grant total of 675,000 xp to get to 11th. You have a little over 60,000 right now. That's right, you're about 10% of the total way to 11th level. Sorry to dampen the mood.

Anyway, Abjure is a great spell, one of the underutilized gems of Unearthed Arcana. Almost broken. Simply put, Abjure attempts to banish an outer planes creature (demon, devil, angel, modron, etc) back to the plane of origin. It's a contested saving throw or something. But that's not what is so hot about it.

Abjure is reversable. The reversal, Implore, brings a creature from the outer plane of the Cleric's alignment. It's out of your control, and I'm not sure if it's an automatic summon, but shit dude. You're essentially casting a 7th circle spell, Gate, as a 4th circle. Because who the fuck cares if the demon is out of your control when there's a ton of other guys to fight hanging around? For as long as I ran 1E games, all NPC priests ever took for their 4th circle spells were Cure Serious and Implores. Sometimes the reversal of Neutralize Poison, Cause Poison, but rarely because 'save or die' magic is boring.