Two things:
A) Are talking about a sustained spell indefinitely? or
B) Just for a few turns as needed
Background on hiding spell effects:
Any spell cast at any stage shows up like a beacon to anyone with Astral Perception. Depending on the magical/anti-magical security your GM plans to throw at you, this issue can range from '
no problem at all', to '
may as 'well carry a loudspeaker and yell 'MAGE' everywhere you go'
Now, to hide that effect, requires the advance Metamagic Technique of Extended Masking (which requires the basic Metamagic Technique of Masking as a pre-requisite)
So the short answer is: No,
you can't hide spells without spending a bunch of Karma
Background on Sustaining SpellsTo start with,
every sustained spell will face a chance of disruption by either a mage counterspelling the effect or a Ward that the mage passes through. There is no way to avoid this chance, and is why even non-Magical businesses will spend a lot of cash on Magical security. However, the stronger the spell effect, the greater the chance it will survive contact with whatever magical security you face....
There are several ways to do sustain a spell:
1)
A summoned spirit can sustain a spell for you.Requirements:
- Summon the right type spirit, which depends on your tradition of spellcasting, and the type of spell to be sustained
- Use a service for the Spirit to sustain the spell, which they can do for a short number of combat turns (depending on services used and spirit force)
-
Upside: No cash or Karma requirement. If the spell is disrupted, get another spirit and recast...
-
Downside: Requires a spirit on standby, and spell only lasts for a few combat turns (a few seconds at a time)
2)
Quicken the spellRequirements:- Either initiate yourself to get the Metamagic Technique of Quickening, OR find a REALLY friendly mage, pay them a HORRENDOUS amount of money, and they may cast the spell for you.. (for reference, Initiating yourself is normally the easier option!)
- Cast the spell, spending enough Karma to keep the spell effect active, but also enough to break through common wards
-
Upside: Spell is permanently up (while you're sleeping, on the job or anything). You can also add extra Karma to make it VERY difficult for the effect to be disrupted.
-
Downside: Can cost a bucket load of cash and/or Karma, gives you an ongoing Astral effect which is damned hard to hide, and if the spell is ever broken, all such efforts are lost and un-recoverable
3)
A sustaining FocusRequirements:- Buy, steal or acquire a sustaining focus of the right spell category and strength for the spell in question
- Spend Karma to bond with the Focus
- Cast the spell (in advance if you like) and the focus will sustain the spell indefinitely (as long as it remains on your person)
-
Upside: : if the spell is ever disrupted, you can just recast the spell. This is a MASSIVE bonus for sustaining Foci. You can also turn the spell off at will to try and minimise your Astral loudspeaker when being sneaky
Downsides: Foci are expensive to buy and bond, and thus anyone who sees it will want to steal it from you
