Beegred asks Buppido and Xilyrah if one of them could finish off the larger spider near them, as Beegred does not want to take another beating like he did last round.

Buppido nods at Beegred and with his hooked spear slashes at the wounded larger spider(A7): Spear attack: 20 If successful, piercing damage: 2

Xilyrah smiles ruefully as she feels a small spider climb up her leg. "Where is Delbert McClintock when you need him?," she thinks to herself.

Hearing her wounded companion's request, she turns her attention to the spider that Buppido has pierced with his spear and sees it curl up and die. Wanting to keep as much distance as she can between herself and the larger arachnids, she stays put and launches an Eldritch Blast at the large colored spider that bit Derendil.

Eldritch Blast: 18 If successful, force damage: 7

Buppido uses his hooked spear to skewer the spider and rip it off it's strand, onto the ground, where it struggles briefly against the spear before curling up in death.

Xilyrah sees the threat to Beegred is taken care of and turns to lob an Eldritch Blast at the spider assaulting Derendil, scoring a good hit.

The small spider on Beegred's shoulder (initiative 16, @B7) bites again...

Bite Attack: 16 Damage: 1 piercing damage.  If it hits, roll DC 9 CON saving throw or take 4 poison damage.

The medium spider (initiative 13, @E8) bites at Tozer...

Bite Attack: 5 Damage: 4 piercing damage.  If it hits, roll DC 11 CON saving throw.  On a fail, take 6 poison damage or half on a successful save.

The small spider (initiative 8) on Xilyrah tries to bite...

Bite Attack: 19 Damage: 1 piercing damage.  If it hits, roll DC 9 CON saving throw or take 3 poison damage.

(Beegred's turn)

CON saving throw (w/ Dwarven Resilience advantage) for Tozer: 20

(Therefore, 2 poison damage, halved again by dwarven resistance to poison; so, a net loss of 2 hp, 1 piercing + 1 poison)

Xilyrah CON saving throw: 7

Beegred takes no poison damage (1 with resistance = 0), but is annoyed by the bite.

 First swing at the spider at B7. If that hits and kills the spider, then the bonus action attack will be on the spider at A8.

• Regular Attack: 18 Damage: 9
• Bonus Attack: 23 Damage: 6 (sigh...)

Beegred swings twice with short sword at the spider stinging him, but the target is small and he misses.

Spider (Initiative 3, @B8) bites at Buppido...

Bite Attack: 13 Damage: 1 piercing.  Roll DC 9 CON saving throw or take 2 poison damage.

(Narstin's turn).

Narstin tries to smash the nearby medium spider with his hammer.

Attack: 21 Damage: 6

(Narstin, there are only nearby small spiders, unless you mean the one engaged with Tozer.  Regardless of target, you miss. But let me know if you intended to move.)

Narstin takes a swing at a tiny spider with his big hammer and it skitters out of the way.

(waiting on Buppido's CON save before posting the combat table.  Map incoming.)

The large spider bites at Derendil again...

Bite Attack: 13 Damage: 5

… then it disappears.

The small spider (initiative 20, @C8) bites at Buppido...

Bite Attack: 20 Damage: 1 piercing damage.  On a hit, roll DC 9 CON saving throw or suffer 3 poison damage.

(Buppido still needs to roll CON save for round 2 and round 3.)

(Derendil, Buppido, Tozer and Xilyrah can act for Round 3)

NOTE!  I missed one spider during initiative (@i10), so it joins now at initiative 8.

Buppido CON saving throw round 2: 5 = 1 piercing damage/3 poison damage

Buppido CON saving throw round 3: 6 = 1 piercing damage/4 poison damage

(Buppido is down to 1 HP)

(Buppido is looking very rough. He has 1hp remaining.)

Combat table, as of end of round 2:

Tozer, eager to put his last errant attack behind him, rears back with his maul and swings once again at the massive spider that stands before him...

• Melee attack: 10 | Bludgeoning damage (w/ +2 from barbarian rage): 6

(You mean the medium spider behind him.  The massive one just disappeared. It's a miss anyway.)

Tozer, confused in his rage as the large spider vanishes, swings wildly at the medium spider that keeps biting him in the back... and misses.

(I missed that the one at A7 was dead by my turn, so would have just attaacked a small one)

 Seeing his foe before him vanish into thin air, Derendil strains against the webs, trying to break free.

Strength: 17

The typically gregarious Buppido is clearly feeling the effects of the spider bites and the poison coursing through his body. He takes one final swing with his spear at the last spider to bite him and then disengages from combat, moving as far from the action has he can (A10).

Spear attack: 16 If successful, piercing damage: 1

Xilyrah sees the spider she hit with her Eldritch Blast disappear and is baffled. Not trusting her eyes, she moves to where she has a clearer view of the webs (C6) and searches her memories for anything regarding disappearing spiders.

Arcana check: 6

(I didn't realize adding in Buppido's attack would alter my Arcana check. It changed the original roll, so I changed it back to what it was, which was a 6)