If you're used to Memento Mundi, it's useful to bear in mind that in Animus, a couple of extra hits can make a big difference (hit ranges are smaller), as can monster tactics, giving monsters long weapons, or allowing them to ambush. Giving monsters healing makes a large difference and should only be given out very carefully.
It may well be that a party with several ranged healing (Forest Touched, Connection Weavers) can handle harder stats than a different party composition. This is something we are keeping a close eye on.
Although Animus has 'lives', in the sense that dying once will not retire a character, this is not an invitation. A death should not be expected on each LARP, and TPKs likewise should be a rare occurence. If someone dies on the LARP, consider downstatting immediately.
If you're unsure of statting, giving monsters optional waves instead of increasing their hits can sometimes be a good way of managing the challenge that the party are facing.
The
Bestiary page can be very useful when working out which monsters to include.
As a rule of thumb monsters with a base damage above single should be user sparingly.