I have been using a trainer, so I was able to get into an exceptionally long battle in the
Temple of Selune
. The scenario is
I killed the Hobgoblin True Soul, despite no one escaping and destroying the drums everyone was my enemy at that point. I moved in to fight the Drow, and she acted abnormal by mistystepping to the ledge connecting to the next room and rallied the goblins there to join in. Soon you have everyone pouring in from every direction sans drums to summon them. Well, my melee specialist got hit by a an explosive arrow and got knocked down the pit so died despite invincibility. I killed Laezel to try to please Shadowheart and so I was stuck with Gale, Shadowheart, and Astarion, with all spells exhausted, to take on Gut and the Drow together with tons of backup - invincible or not.

But getting on to where the bugs show - the first mentioned opponent used mage armor around 15 times and healed around 10 times - suggesting these are both cantrips rather than something they have in a limited quantity like monsters are supposed to have. Who knows how many buffs she handed out each turn. The other also healed around 5 times. That is overpowered, not a valid conflict - of course presuming I wasn't cheating myself. The cantrip issue is something that needs to be addressed. I think I went around 50 rounds to beat everyone which included running around the place with dash since five goblins were perched on the ledge and the ladder up from my side got destroyed - I also fogged it to limit them and couldn't mistystep up there with Astarion.

In addition, I have seen that Shadowheart had a 30% chance to get a successful melee hit against the latter enemy. She missed 12 times in a row with that same chance, before getting a hit. There is a 1.4% chance of that happening by the dice. Lots of unlikely constant misses there - she also missed one of the goblins, with a 50% chance, four times in a row once they were down to 2% - a 6.25% chance. A lot more missing than expected on other high probability hits, but not nearly as disparate from the stated odds when it was likely.

I may have accidentally downloaded the Wil Wheaton version of the game - but otherwise, despite my suggesting that unlikely things just happen in another thread, I think the numbers may be off and may need to be examined where a glitch may exist. 1 in 100 encounters may have that single miss in a row streak, but when you start adding them up it becomes much more likely the game is not working properly than that such bad rolls would come out that many times over the course of the fight. It's possible that it's just bad luck, but more likely the rolling subroutine needs some fixing.