@TomasGrizzly I've not had the "summon elementals" fail on me, if that's useful feedback to help you narrow down your bug.
Also been wondering about that. Sulani Mana is just a trait, so that can pass on to any sim of any lifestate. How easy creating a sim with both will depend on the exact mechanics of Magical Bloodline.
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I've guessed that we might be able to create a 100% alien with the Sulani Mana trait if a male sim with the trait gets pregnant by abduction. But I haven't tried it, or searched to see if anyone else has.
The whole plan would be:
1. Have male sim in the household with Sulani Mana - by moving in an elemental or raising a sim from birth.
2. Pursue science, do everything to increase abduction chance (I know how to do it, it's how I got Vlad pregnant - it was the only way, no woman was ever going to touch him)
3. Make sure his child is female. She will be 100% alien, with Sulani Mana, hopefully.
4. When she's grown up, she learns all the magic.
5. Then, only when she can pass on the Magical Bloodline trait, she has a child with Father Winter in the Brindleton Bay lighthouse (though that was buggy last I tried): 50% alien, born with 4 special traits.
I'm personally not that excited for witches and bats, but the strategy of breeding in these different traits is what I like planning for.
Here's a quote from SimGuruNinja on August 23, on the official forums:
"Your parents' spellcasting abilities (and THEIR magic lineage) will factor into a Bloodline trait passed to their children. This trait will provide an advantage to spellcasters (and there are various levels of strength to it)."
So for the purpose of children, I reckon if both parents are spellcasters, you'll get a stronger trait than if only one is. So if the father is Father Winter, for example, you might get more traits, but the Magical Bloodline trait will be weaker because of only one spellcaster parent. That's my understanding.
1. Get Sulani Mana into the family
2. From there, just marry spellcasters