For much of the game, Staff of the Magi + Robe of Vecna is a really overpowered combination.
I mean, all you have to do is cast a spell with a casting time of 1 usually, click on another weapon, and then click back onto the Staff to become invisibile. This combo makes Imoen quite the armageddon machine of death and destruction. It gets even worse with Edwin.
Come the later phases of TOB, especially the Ascension mode, it is far more frequent for monsters to be able to see past the invisibility though. And of course, they're also more magic resistant. At this point, I can say things have by then been balanced somewhat.
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