Inspired by the thread concerning the general uselessness of automatons, I'm starting this thread to discuss other mystery virtues that are, for one reason or another unexpectedly naff, overly expensive, vastly impractical or just rubbish.
This can be for any reason and I'm interested not only in fluff/background reasons but actual practical reasons for gameplay purposes.
I'll start with two of my favourites.
Philosophic Alchemy - minor
Now while the major version of this is awesome, the lesser version is far, far less so. Why? Because it requires a year of lab work. Now my sagas might be different from standard but we almost never have an entire year of labwork seasons, making this virtue nearly unusable. One could imagine that in a labwork focused chronicle this would really come into its own.
Hall of Heroes, Living Ghost, Greater Potion - All of these grant immortality, each with various quirks. While I really like all of them, the effect of turning a magus into an unchanging, immortal being really cripples any hope of advancement except through exceedingly powerful magic, effectively reducing character progression down to a crawl (and a slow crawl at that). While I like the ideas as presented, I also would never use any of them in game due to this inability to advance.
Anyone got any others?