I liked the shield drain mechanic of the spectre field (where it drains your ally’s shield as compensation for the invisibility buff). If you decide to nerf it later on, just put it back on, (the shield drain from allies, to take away from their pools) and keep all of the stats.
The best way to work with a spectre field that drains your shield, is to have a great amount of shield regeneration, which can be fitted with great defense.
Anyways, now guards who have spectre field will be able to have an unlimited supply of shield regeneration for those 5 seconds, no matter how little shield an ally ship has in its supply.
This isn’t a suggestion to nerf it, or to buff it. I just don’t want it to lose anything on the balance side.