Display evoke/invoke chance in dump

[VeryAngryFelid]

See title. It can be useful and hopefully it is not too hard to implement. Inspired by a thread where player wrote

  Code:

Drain Life = 1%

Enslave Soul = 7%

Evoke Invisibility = 38%


While asking for advice in dangerous situation.

[VeryAngryFelid]

Incidentally I have just analyzed an end of win streak in the tournament:

  Code:

A centaur comes into view.
The centaur shouts! You hear an angry hiss.
The centaur wields a shortbow. The centaur shoots an arrow. The arrow hits you!
The centaur shoots an arrow. The arrow hits you!
You take 15 damage, and have 15/30 hp. MASSIVE DAMAGE!!
...
You fail to use your ability. The centaur shoots an arrow. The arrow hits you.
You take 2 damage, and have 13/30 hp.
You fail to use your ability. The centaur shoots an arrow.
The arrow barely misses you.
You fail to use your ability. The centaur shoots an arrow. The arrow hits you!
You die...

It would be useful to know the chance of that transform bat ability.