Exhaustions only affect Warriors.
Exhaustions take effect once the Manoeuvre is completed. At any point you would take a stack of Off-balance, you may choose to instead take a stack of Faltering.
The durations of all negative effect calls you receive are increased by 2 seconds for each time you have stacked this Exhaustion. This does not apply to the STUN caused by any stacks of Faltering you may have.
You take STUN X from each damaging attack against you in addition to its other effects, where X is the number of times you have stacked this Exhaustion. This effect cannot be prevented with IMMUNE or NULL but may be shaken off with a VOID (one VOID ends one instance of it taking effect, not the whole Exhaustion).