Turns out we had to fight another Dragon, though optional, it was rather easy...he barely made a dent on us. When it came time to fight Irenicus, it was...hard, but we later figured out that if we took things cautiously and let my Ranger do most of the work, we could easily defeat him.
Arriving in Bhaal's Realm though was a whole different story, after going through some short trials, we had to fight Irenicus one final time, while we won on the very first try, my Mage/Thief wasn't so lucky as she got petrified and shattered by a fireball that went off near her, prompting us to do it all over again.
However, we finished the game and i'm super happy about that :D
Next up is Minecraft which i'm going to show my friend with the hopes that i can convince him to buy Terraria later on and afterwards, Icewind Dale...we'll return for Throne of Bhaal at a later time.