Dungeon23 Room 247 (Descent to the DeepWild)

I say "why so many spear taps" because if they get past the spiders, there is ANOTHER SPEAR TRAP!! (DMG pg. 172) Then there is a medium chamber with 2 boulders and 53 Giant Ants (AC 3 HD 2 MM pg. 7) Their ant hill has 3 openings.