Thanks for the advice, everyone.
When playing the Ljos, how do you usually handle your mana nodes? What do you prioritize?
I have one mana node in my capital's third ring, solidly mine. There is a second to the south, I should get it as my third city's culture will block the Bannor from the area and it is on a peninsula no one else should be able to reach for a while. I also have found the Standing Stones in that area, so that will provide Earth mana.
I have a lot of desert to my south and southwest - 20+ tiles of desert in an area with some rivers and nice resources (incense, rice, pigs, gold, fish). So I am thinking I will need a source of Water mana to spring all those tiles. Something to provide siege ability also sounds like a very good idea, so maybe Fire for the other node? Or are there better options, or other ways to get the Water and Fire?
Those are good choices; if you are going to attack, having fire can be good to take defenses down. Water not only allows you to spring the desert, it also allows prevention of the 'nuclear wepaon' against the elves - burning the forest down. (Fortunately, the AI doesn't do this very often, but when it happens....)
There are of course other good choices. Body is good, without catapults it makes the whole army faster. Enchantment and death are usual favorites, but I tend to be less favorable to them for the Ljosalfar. Guardian of nature gives a lot of happiness (one of the benefits of enchantment) and the Ljosalfar have a lot of non-mellee units so the first level enchantment ability means less. Death spamming isn't so useful to the Ljosalfar since it is common to tiger spam and often keep living units (especially if you get body). Of course, you already have air and life (and nature) from your palace and you will get earth from the standing stones, another good one.
So I like water and fire in your position, with possibly body instead.
Best wishes,
Breunor