Encounter 3 - Adventure Pack - Box 1 Bundled with 6.6-A307-P Introductory to achieve a stronger fit the bottomless pit Ice Theme Tray:Magma River Curve/Magma Mouth 5-B108-P

to achieve a stronger fit and better functionality

4-ST-010 Curved Elevation Half Block 4 4-ST-003 Short Stairs 2 4-ST-008 Tower Stairs - Left 2 4-ST-007 Tower Stairs - Right 2 4-ST-011 Curved Stone Stairs 2 4-ST-002 Stone Stairs 2 4-ST-004 Elevation Half Block 1

So this pack should let you swarm your PCs appropriately

This huge set has a full assortment of the Magma River pieces

Hope your dexterity is decent

Encounter 3 Adventure Pack Box 1 Bundled with 6.6 A307 P Introductory to achieve a stronger fit the bottomless pit Ice Theme Tray:Magma River Curve Magma Mouth 5 B108 P to achieve a stronger fit and better functionality 4 ST 010 Curved Elevation Half Block 4 4 ST 003 Short Stairs 2 4 ST 008 Tower Stairs Left 2 4 ST 007 Tower Stairs Right 2 4 ST 011 Curved Stone Stairs 2 4 ST 002 Stone Stairs 2 4 ST 004 Elevation Half Block 1