[Xedra Evolved] Rework how elemental fae gain terrain bonuses

[Standing-Storm]

Summary

Mods "[Xedra Evolved] Rework how elemental fae gain terrain bonuses"

Purpose of change

Elemental fae of any real power should never fail their spells if they're in their home terrains. Maybe some day magic_type can handle it, but for now we need EoCs.

Describe the solution

Swap the elemental fae EoCs around. Now, when you're in your native terrain, the Difficulty of all spells is reduced by one-half your total elemental fae traits. This pretty rapidly makes all spells trivial to cast as long as you're in an appropriate environment.

Change the penalty to reduce your caster level by 4, plus you don't get the benefit of the above EoC, making magic much harder outside the native environment.

Also, add the Arvore class to the Creeper Ascends the Wall spell (which was missing it), and split The Wind Blows, the Willow Bends into Arvore/Sylph versions so that it can benefit/suffer from these EoCs. Add a load EoC to handle the split for existing characters.

Describe alternatives you've considered

Testing

Checked in favored and unfavored environments, spells were benefited or penalized as appropriate.

Loaded a game that had the generic Wind Blows, the Willow Bends trait. It successfully converted to the Arvore version

Additional context