If anything, I'd like to see edges to allow something akin to this for all terrain-based ranger skills in general, with a few caveats:

- something like swarm of leeches could be cast and would have a diminished effect outside of a swamp. However, wanderlust check has to succeed, terrain has to make sense, and conditions have to be right. i.e. there may be one or two leeches in the forest that come out when it's raining, but not in the city on a dry, hot day. Or, you may be able to call a whirling simoon on the road where there's a lot of dust, but it's not going to be as effective since there isn't as much sand, and it can't be raining. This would *at least* allow for spell spam while ranking so that when a ranger would get an actual chance to use it, you have less of a chance of failure because you never get to practice it.
- the edge be moderate in its edge point cost