As I've started decorating houses again it's become readily apparent how much missing potential monstrology has. Most creature types in most worlds cannot be harvested.
You can't extract Krok animus in Krokotopia (except some of the undead ones, but that isn't the same)
You can't extract cat and dog animus in Marleybone despite them being the signature creatures of that world
You can't extract samoorai animus in MooShu
You can't extract water mole animus in Celestia (so much for a Skull Island themed house)
You can't extract lion or tiger animus in Zafaria
I could go on, but I think you get the point. It's disappointing that there aren't more options.
One way to solve this would be to add animus extracts for all creature types in the game. That may just create too many monstrology spells, however. A better way to do it, imo, would be to add rank-based animus extract spells to the game. So, a spell that would extract animus from creatures that are Rank 1-3, another one that would extract animus from creatures that are Rank 4-6, and so on.
I also think the price for buying animus extract spells is way too high. There's no good reason for them to cost 100k gold. The most expensive fishing spell is only 10k gold. I suggest dropping the cost of animus extract spells to 10k gold, or at the very least 25k gold.