Your god will not give you random prayer boons until after you have received a sacrifice gift from them. (They will still fix troubles when you pray.)

When you are gifted a spellbook by your god as a prayer boon, the book will always be your role’s special spell if you don’t already know it. (Possibly, they won’t give it to you if you have it identified, or they will give it to you if you know but have forgotten the spell.)

Convicts can uniquely get their god to unpunish them as a special prayer boon (or maybe sacrifice gift that replaces an artifact). This requires some prerequisite like a certain amount of alignment record, so that it can’t randomly happen only a few hundred turns into the game.

As a prayer boon, when you have a certain amount of unidentified objects in your inventory, your god can grant you identification.

Gods can grant you (unique?) pets as a sacrifice gift, or possibly a prayer boon. Example here was Sleipnir for valkyries. If it’s a steed, it will always be saddled.

“Awe” intrinsic, granted only as a divine boon for a short duration: any monster you hit or that attacks you automatically gets scared.

If a god doesn’t have any good artifacts or spellbooks to grant you as a sacrifice gift, they give you a prayer boon instead.

One of the prayer boons you can get from a god is intrinsic light: you become a light source (probably of radius 3, but could be 4). Crowning may give you this permanently, since you’re now all holy.

Don’t gift a character a spellbook as a prayer boon if the character is illiterate or certain roles (like cavemen or barbarians), and if a spellbook is given limit its level somehow so that a character doesn’t get a spellbook of much too high level.

Barbarians and cavemen get weapons/ammo instead of spellbooks as a prayer boon, or enhancements to their current weapons.

Other priest benefits: the chance of receiving a sacrifice gift is doubled, make it easier to get crowned or other high boons, the prayer timeout isn’t increased when crowned.

Zen or illiterate players get spells for free as a prayer boon where they normally would have been granted the corresponding spellbook.

Replace the passtune boon with something more useful, since it is only marginally useful to spoiled players. Then, let the Oracle provide the passtune as either a major consultation or as a service. The Oracle can also be used to tell you which prize is at the end of Sokoban.