Was the Enchanted Black Ballista mentioned in the previous chapters prior to them entering the cave? I forgot since this shit updates monthly... If not, that's some disappoint Deus Ex Machina shit.

No, I can't be bothered to go through the previous chapters again - that's no fun either.

For me this is the 1st bad chapter for the Year-One spin-off and the entire Goblin Slayer series. The previous chapters were either great or OK: just disappointed we didn't get an update on GS's situation and the Rock Eater battle is turning into a generic adventure fantasy fight.