Actually there is a spell in Digital Grimoire that basically turned a foci 'off'
Disrupt [Focus] (Direct)
Type: M • Range: LOS • Damage: Special • Duration: I • DV: (F÷2) – 1
This spell channels magical energy into disrupting an active
magical focus, dealing temporary damage to its astral form.
A focus that receives damage equal to its Force from this spell is
disrupted and becomes inactive; the magician bonded to the focus
cannot gain dice bonuses or any other benefit from the focus until
the focus is reactivated. A number of boxes of temporary damage
equal to the focus’s Force is “healed” at the beginning of the next
Combat Turn. The owner may spend a Simple action to reactivate
the focus when all damage is healed. Disrupting a sustaining focus
will also disrupt the spell it is sustaining. Astrally projecting magicians
whose foci become disrupted cannot reactivate them until
their astral form rejoins their physical body.
Disrupt [Focus] is designed to target a specific type of focus:
Disrupt Weapon Focus, Disrupt Anchoring Focus, Disrupt
Spellcasting Focus, etc. The target of each spell is designated by
the spell formula. A stacked focus is affected by this spell if at least
one of its focus types matches that of the spell, but the damage
dealt by the spell must equal or exceed the combined Force of the
stacked focus to disrupt it.
Granted this was SR4, but would not be impossible to recreate for SR5 purposes
They have already said there is a ton of magic stuff that didn't make the main book but will be in a followup Magic book, so I expect we will see something there covering this.
Personally I think the recovery time for the above is a little quick, basically wait a turn or turn and it is back up.. I would have made it take longer to recover to make it more effective, like 1 force per hour unless a Mage with Assensing + Cleansing could go in to reset the item so to speak and cut the return time by successes or something.
Disrupt [Focus] (Direct)
Type: M • Range: LOS • Damage: Special • Duration: I • DV: (F÷2) – 1
This spell channels magical energy into disrupting an active
magical focus, dealing temporary damage to its astral form.
A focus that receives damage equal to its Force from this spell is
disrupted and becomes inactive; the magician bonded to the focus
cannot gain dice bonuses or any other benefit from the focus until
the focus is reactivated. A number of boxes of temporary damage
equal to the focus’s Force is “healed” at the beginning of the next
Combat Turn. The owner may spend a Simple action to reactivate
the focus when all damage is healed. Disrupting a sustaining focus
will also disrupt the spell it is sustaining. Astrally projecting magicians
whose foci become disrupted cannot reactivate them until
their astral form rejoins their physical body.
Disrupt [Focus] is designed to target a specific type of focus:
Disrupt Weapon Focus, Disrupt Anchoring Focus, Disrupt
Spellcasting Focus, etc. The target of each spell is designated by
the spell formula. A stacked focus is affected by this spell if at least
one of its focus types matches that of the spell, but the damage
dealt by the spell must equal or exceed the combined Force of the
stacked focus to disrupt it.
Granted this was SR4, but would not be impossible to recreate for SR5 purposes
They have already said there is a ton of magic stuff that didn't make the main book but will be in a followup Magic book, so I expect we will see something there covering this.
Personally I think the recovery time for the above is a little quick, basically wait a turn or turn and it is back up.. I would have made it take longer to recover to make it more effective, like 1 force per hour unless a Mage with Assensing + Cleansing could go in to reset the item so to speak and cut the return time by successes or something.
I admit we were fous lite in 4e, but its an astral object why can't you just attack it? Focuses were always capable of being destoryed from the astral, did they actually take that away?