ToME: the Tales of Maj'Eyal

I think this is because bs is counted as a teleport type talent.

It is a bug though, as I think it should work in vaults, and it is a nasty surprise to discover it doesn't!

Not a bug. Blindside is a teleport, you can't use it to get to no-teleport spots. Cursed have Reckless Charge for gap-closing in vaults.

Perhaps talents could explicitly state if they are teleports. Or at least teleport talents that won't work inside vaults.

Much like how talents that are spells have the "Is Spell: True" information displayed.

One thing that was unexpected for me was the talent necromancers have to teleport their minions to the necromancer's current location actually works inside vaults.

I'm not talking about getting inside our outside of vaults, I'm talking about when I am inside the vault and an archer appears, having just blindesided to 1000+ archers, I naturally blindside to the archer, and not only does nothing happen, blindside gets put on cooldown (and that IS a bug), AND, I lose a turn (and that IS a bug too).

So, either (a) let it work inside a vault (but not crossing vault boundary) or (b) disable it so it doesn't cooldown and use a turn, which has almost killed me on several occasions.

There does seem to be some inconsistency with the no teleport rules. Dark Portal for example works.

I am guessing that the no teleport is to stop players jumping through walls and bypassing dangers.
If this is the case, then teleports that use los aren't a major problem (except for teleporting across lava).
If you can see the target position and can walk there without leaving your current los, it should be allowed.
Coding it is a little bit harder though.

Perhaps a nice red highlight when you attempt to target a no-teleport zone?