1% fertility means that your lioness has only 1% chance of getting pregnant, on the contrary. Imagine that when you breed her you roll a 100-sided dice and she can only get pregnant if it hits that one side with a 100 on it. The number of attempts doesn't matter as the chance is calculated separately every time. You could get her pregnant on your first attempt if you're really lucky, but you can also spend over 500 and she still won't get pregnant if you're really unlucky with the metaphorical die rolls. It is unrelated to events.
Angelic blessing is an option but it's usually not worth it unless you're breeding a mutie - chasteberries will do.

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1% lioness can possibly get pregnant in 1 try, but the chance of it happening is extremely low - she has 1% chance to get bred, so, there's 99% chance that it wont happen. It is better to use angelic blessing or black stallion to have them breed on first try, indeed, or you'll be using a lot of energy on them.

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