-- Round 1 --
Vuoor digs through his pack and retrieves a daylight pellet, as he tumbles around the drow. He doesn't tumble quickly enough though, and the drow reacts, but Vuoor manages to duck the blade. He tosses the pellet, which explodes as it hits the ground near Dargo's feet, filling the cavern with brilliant light. The drow squint, blinded by the light. Vuoor himself is also blinded. Dargo is in line with the tunnel, and the light from the pellet shines down it, blinding Denasa as well.
Bull, obeying Morph's command as best as its vermin brain can, takes a double move forward, squeezing past the others in the tunnel. It heads towards the drow on the left. The drow hears the large beetle's chitinous feet as it closes with him, but blinded, is unable to swing his glaive at him. Bull rushes towards the drow, running into the ropers strand attached to Rune, which slides up over the beetle's bodys. Bull ends his move in front of the drow.
Morph moves forward to the mouth of the tunnel so he can direct his spell, and casts. Near-invisible spikes grow out of the ground, surrounding the drow and roper. Morph knows where he placed the spike stones, but they are near invisble to others.
Solli climbs up the wall and moves towards the mouth of the tunnel. As he goes he downs a small vial, and disappears from sight.
Dargo snarls and swipes at the strand attached to his body, severing it.
-- Round 2 --
Following Dargo's lead, Rogoth swings his axe at the strand attached to him, severing it.
Denasa sees the flashing glaives of the drow move back from the mouth of the tunnel before she is blinded by the daylight pellet. She leaves the ground, and flying blind, moves forward until she bumps into Morph.
Rune manifests biofeedback and moves forward.
The drow swing their glaives blindly, hitting only air.
The roper pulls Rune forward an additional 10 feet. Poisonous secretions flow from the strand into her body, and Rune feels strength rush out of her body. The roper fires more strands. Dargo swings his urgrosh at a strand, but misses. The strands hit Vuoor, Dargo, Rogoth, Bull, and Morph. Strands miss Denasa.
Initiative
Rogoth: roped
Denasa: blinded
Rune: 11 damage, roped, biofeedback (dr 6), -8 Str
Drow 1: 19 damage, blinded
Drow 2: blinded
Roper
-- action paused --
Vuoor: blinded, roped
Bull: roped
Morph: roped
Solli: invisible
Dargo: 40 damage, roped
I'll say Vuoor retrieving the daylight pellet from his backpack is like drawing a weapon, not retrieving an item, so he doesn't provoke an aoo. Vuoor fails his tumble roll. Vuoor could close his eyes to avoid the blindness, but the effect would be the same, so I figure he might as well keep his eyes open.
Bull running through the rope strand is treated as a bull-rush attack. Bull's strength check failed to break the strand.
Morph's spike stones are detectable only by a rogue with a dc 29 search check. Describing exactly where they are is a little too complicated for Morph to do in a combat round, so they are invisible to everyone else.
Dargo's attacks: 3+14 vs 28 fails, 16+9 vs 18 succeeds, damage 4+10+4. The strand is severed.
Rogoth's attacks: 18+14 vs 20 succeeds, damage 5+6. The strand is severed.
Rune can't see the location of the spike stones, and misses them through sheer dumb luck.
Rune's fort save: 4+6 fails, Rune take 8 Str damage!
Roper's attack rolls: 20 against Vuoor barely hits, due to Vuoor being blinded. The roper shoots a strand against Dargo. This is a touch attack, not a grapple, but I'll allow Close Quarters fighting to be used against it, giving the strand the same AC as the roper. Dargo rolls 9+14 to hit the strand and misses. 27-4 hits Dargo, who has soft cover from Rune. 20-4 hits Rogoth, who has soft cover from Rune. 19 hits Bull. 24-8 hits Morph, who has soft cover from multiple creatures. 21-8 misses Denasa.
Vuoor is up. His blindness will wear off just before he acts.