When crossing a Threshold uninvited, what does a Wizard has to deal with?
Does the Threshold strength reduces Spells Power (Shifts of power limited by Conviction), Control (Discipline test to handle/target the spell) or both?
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A threshold can operate in four different modes: as a block, a target, a suppressor, or a source of harm.
In the context of this question, target and harm aren't relevant, but block and suppressor are.
As a block, the Threshold sets a minimum difficulty. As a suppressor, affected spells and abilities lose a number of shifts equal to the strength of the threshold.
"Does the Threshold strength reduces Spells Power (Shifts of power limited by Conviction), Control (Discipline test to handle/target the spell) or both?"
Well, one or the other, depending on whether it's a block (Control/Discipline) or a suppressor (Power/Conviction).
It's up to the GM to determine which of the two options are more appropriate based on the fictional positioning.