You need to have the unit you want to target activate the Ritual Target ability.
Really? I already knew that, I've put my unit as "Target ritual" but still, nothing happens, my mage is still held, and the "target" gains nothing, but "target promo"
Once the target is designated, the you can cast the augmentation using the mage; I would make it a popup like the 'Load' command that you have with ships (which would give you a list of the viable units on the tile), but I don't know how to do that.
JHERAL: When you put Iram back in, possibly give him his own line of unique units? Given that he's barred from both of the Mekaran military options, and an Altar victory is far and away his best bet, perhaps a unique line of tough, defensive Disciple units down the religious path? (If Zarias is the Mind and Jamaal is the Metamagic, figure Iram should be the Body)
He will have his strengths: I'm greatly improving his trait, once dynamic traits is merged into RifE. It will give increasing health, GPP and non-military production bonuses (the trait he has now is the first stage, with all three he will have twice what it has).
I might consider adding some units, though. I'll have to essentially remake all units once it's time for the unit pass anyway, and I have some thoughts that might fit him.
By the way, he isn't locked out of anything; he can't build the Battle Sluga, true, but he can still create them from slaves. The only things that Jamal has that he doesn't is Karas and Behemoths.
BTW: "Casting bloom" spell for overseers and slugas is really broken: When the spell is done, the promo is not removed, hence they (overseer and sluga) remain held, and the only solution I could find is to enter WB and remove the promo manually.
EDIT: I suggest you to remove Battle overseers promo that enables them to cast "Maelstrom". Maelstrom is already a very risky spell (It also damages the casting stack) and the 1 turn casting makes it even more unreliable.
I'll look into the Bloom thing. Are you sure it's not just the fact that the promotion has a duration (i.e. you have to wait until it goes away, after which the Sluga will plant the forests and be free to move again)?
The Maelstrom is kind of intended, really. Once you get Sluga Commanders, you get a version that only targets enemy units. Keep in mind that the spell only has a range of 1, too, so it's not that hard to keep your own units away. I could remove the duration, though.
Edit: Oh, and the updates aren't really patches; I update the whole thing, and upload it. So yes, it's cumulative.