After obtaining the book, continue forward. You'll come across another fork in the road. However, it doesn't matter which path you take, as both routes connect. The author chose the left path first.
Let's head over and take out this group of enemies first. We can climb up the wall on the right to reach the archers on the second floor.
After defeating all enemies, a mini-boss named "Iron Kill" will spawn. This mini-boss is essentially an enlarged version of the regular mobs; just be careful of its fire attacks.
Defeat it to obtain the Soulforging Material "Iron Kill Mask".
