So, I would like to hear how other people have used invisibility runes to good effect (this topic is in spoilers, so spoil away

In an effort to give invisibility runes the appreciation they deserve, I will now chronicle a situation in which one was used typically. Character link is here (ghough temporal warden).
The following screenshots are from Rak'shor Pride(2), and it's important to cover the events leading up to the first screenshot. Upon entering the level, I immediately teleported away from the greeting party, because I didn't stand a chance against that particular group (well, perhaps I would have had I used an invisibility rune

This leads us to the first screenshot: "What to do?" One wrong move and my game is over. I need to survive for three more turns, after which a shielding rune becomes available (and other abilities shortly thereafter). What should I do? Teleport again (I have three teleports from equipment available)? Try to run away for three turns (ghouls move slowly, but this is partially offset by celerity and speed)? Try to blind the group? Try to stun the group with chronomancy/stop? All of these options have unmitigated risks and would likely lead to my eventual--or immediate!--demise. So what I ended up doing...
...was use an invisibility rune, of course! Success! The top image is immediately after I used the invisibility rune. Nobody hit me! I quickly killed the blood mage who had unknowingly moved next to me, and I managed to survive for three turns following my last teleport. The lower image above shows the instant I used a shielding rune ("Damage Shield" in the effects list), and I was now feeling fairly confident.
Much carnage followed, and I was no longer invisible five turns later: Ah, much better! This battle was basically over, and I had emerged victorious--hurrah!! I don't care that invisibility runes have a finite number of charges, because each charge is a wonderful magical gift that keeps my character playing!
Anyway, the above situation isn't the most insane or amazing thing I've done with invisibility runes (do you want to beat the ambush with an incredibly low level character? Use two invisibility runes!), but it is the most recent. It is also a typical survival usage of invisibility runes. To make them even better, they can also be used to good effect as a preemptive offensive measure: go invisible then wreak some havoc!
