This is a rolemaster sourcebook filled with lists and lists of priestly spells. It is one third of the _spell law_ sourcebook (3rd ed.) which is now out of print. The other two are _of essence_ covering straight mage magic and _of mentalism_ covering psionics. It also includes the various priest based rolemaster professions. It is useful for spell ideas for any system. In particular GURPS or D&D and of course Rolemaster or MERP. For D&D it works well for expanding the list of domains as the spells are categorized by theme with one spell for each level
The spells are clear in what they do and easy to translate into other systems.