Fix miscast protection

[VeryAngryFelid]

It is widely known that some players cast Dragoncall with Sif Muna when having 50+% failure chance before going downstairs (probably even with staff of energy!). I think it is abusing game mechanic and should be fixed.
Here is a list of possible fixes:
1. Replace miscast protection with wizardry
2. Remove all positive statuses when using stairs or closing/opening doors (fixes problem with ozo armor, spectral weapon, buffing before entering Vaults 5 etc.)
3. Change dragoncall to check failure rate when a dragon is summoned. If check fails, spell immediately ends.

[njvack]

I'm kind of agnostic as to whether miscast protection is a good mechanic but "stairs have a dispelling field" might be interesting?

[Shtopit]

Or just "Dragon Call deactivates when you take stairs".

[njvack]

Yeah. It's functionally a summon and summons expire when taking stairs.

[Tumalu]

Yeah, this is only a problem for one specific spell. The solution is just making a reasonable spell adjustment, not changing a whole mechanic. Making Dragon's Call expire when using stairs makes sense.

Even then, it's not like Sif is amazingly powerful to need a nerf, it's just leveraging your god power in a useful way. But adjusting the spell seems reasonable regardless