Invisibility should work fine on laser beams (well, depending on how you rule invisibility vs thermographic vision, I think most people say that it works fine versus infra-red).
I also have a shaman in my game who enjoys invisibility and spirit concealment (and silence, too). My list of challenges include:
- Concealment isn’t so useful if you aren’t being stealthy. All uses of sneak are going to slow you down, and the more sense you are trying to avoid the slower you will tend to be. In particular, if you are trying to sneak through ultrasound you are going very slowly. If they can detect ultrasound they’ll know when they need to do this and when not to, but motion detectors are one of the easiest forms of security so should be quite common.
- Locked doors. Sure maybe the group can open them, but they can’t easily conceal that they are opening them (i.e. they’d need to hack the cameras that have view of the door and loop them, and if any guards have line of sight on the door then it is even harder)
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- Wards/mana barriers. In my view of things, companies will put wards around all their external entrances, and all higher security areas of the company (i.e. where the runners are apt to want to go – including computer centres, executive offices, and guard rooms. Sometimes to be cheaper they may only put a thin ward around the wall where the doors are (you have to sleaze through both sides of the barrier to get your spirits and spells through, so two chances to mess up).
- Guards with good perception skills and decent attributes can work wonders. (or security spiders with high electronic warfare). On top of all the buff young guards you could have one older guy with higher willpower, logic, and intuition and some upgrades, who is rolling 9-10 dice to resist illusions and possibly up around 14 on perception tests.
- Regular patrols by watcher spirits. They can’t cover everything, but if you are moving slowly (see the stealth discussion above) then the odds are good that they will spot you eventually.
- In certain areas: background count
- Awakened guards. Sure mages are really valuable, but a substantial portion of all awakened are pretty weak. If you have magic =2 and are an aspected summoner, your most valuable skill may simply be astral perception. Not something that will be believable at Stuffer Shack, but at higher security sites it isn’t out of the question.
- For really high security/fiendish location, a security mage sitting at nexus of fibre-optic lines with wide angle lenses at the other end, so that they can target spells at many places in the facility, while sitting back in the safety of the security offices. This doesn’t help with detecting the party in the first place, but it may allow the security mage to dispel the invisibility at just the right (or wrong, from the runner’s perspective) time.