Well - I´m still having the problem that I´m not able to leave the 5th level of Od Nua cause I have an immortal but non-existent summoned creature via an item I found earlier in the game (it´s a horn). Cause of that the game says everytime I shall gather my party - which is impossible to do. Therefore it´s impossible for me to go on playing.
Please fix this bug, cause it´s game-breaking and I don´t want to restart the whole game.