Blue will charge straight towards them and start trying to snack on them.

Attack: 9 Damage: 9

Blue manages to snap up a few of the centipedes! They taste... itchy.

Mark climbs over some rocks, getting a better vantage point and closer to the centipede (within thrown weapon range). He lets loose the axe, then pulls out his battle-axe and moves back to the group. 

Attack: 18 Damage: 9 

 Mark sends his hand axe clattering against the rocks as he swipes a few more off the rock at Blue-bird's feet.

The swarms crawl up Blue-bird's feet, nipping and climbing, burrowing under feathers to get a bite at his flesh. He gets bit hard, and dancing about on his bird legs, dislodges a fair number that swarm him.

Attack: 13 Damage: 5

Attack: 10 Damage: 12 MISS

Attack: 23 Damage: 18 MISS

One of the swarms that gets knocked off after trying to bite Blue-bird heads in Son's direction. ((Blue can OppAtt.))

((Attacks on the swarms on Blue will have half cover, with the potential to hit him instead.))

 ((Lets all be glad that it was the less than half HP swarm that crit, I don't think Blue wants 8d4 damage...))

AoO: 13 Damage: 6

Talon circles above and fires another bolt.

Attack: 23 Damage: 10

Son stabs out with his dagger at the swarm closing on him (if it is still alive otherwise he will move to help Blue).

Attack: 20 Damage: 5

Forgot I should roll with disadvantage: 1

((Maybe still hits?))

Talon snipes a few off of Blue!

((Brings both swarms on him to under half HP, so they do reduced damage on a hit.))

Ember will try to find a vantage point from atop a rock and will try to fire an arrow from her short bow towards the swarm heading to Son. 

Attack (no mod): 6 

Damage (no mod): 3

Can Big' Un get off a level 1 ice knife without hitting his friends? if so he will do that if not he will continue to retreat and use a fire bolt

also, how far was Big 'Un from Ember...could he have grabbed her and carried her with him?

((You could probably get the one near Son without hitting him, but your ice knife was the most effective attack so far, the cold blasting across all three swarms previously. Blue does have the buffer of his wild form, and the swarms on him are looking pretty rough... Ember used move and dash, so she's actually a few feet farther up than Big Un at the start of his turn.))

Big'Un will try to hit the swarm near Son with ice knife @ level 1 for  3 piercing damage and 10 cold damage if it fails a ? DC DEX save

He will also try to remember anything that may help them out of this situation......memory die: 3

((Big Un, give me an attack roll for the piercing part of that?))

You're pretty sure that you could really blast those ones that are on Blue, and maybe even make sure not to hit him...

if I can get the ones on Blue I'll try but I don't want to hit him.

sorry....forgot the attack roll. attack (no mod) : 7

Big Un sends a blast of cold at the centipedes near Blue, confidently sculpting it to do no more than frost a few feathers. ((You know the Careful Spell Metamagic, and have expended 1 of 3 sorcery points.))

Swarm Dex: 6

Swarm Dex: 18

The sharp shard of ice misses, but the explosion of ice cuts deeply into one of the swarms, freezing and shattering against the rocks. You look down at the wand in your hand that you instinctively drew and used to cast the spell.

Son, you feel a heat building inside you, one you are aware you could unleash on these centipedes if you so wished. ((You have a fire cone Breath Weapon from your Draconic Ancestry, and have regained a Memory Die.))

((Would I hit others in the cone? Centipedes or teammates?

If he would hit teammates he wouldn't.))

Reflexively Son vomits forth a gout of flame at the centipedes.

Wiping his mouth he coughs and says,

"Excuse me! Uh, is that normal?"

12

((It's only 2d6 fire, in a 15 ft cone, Dex save vs 8 + prof + CON for half.))

Dex save: 17

Most of the centipedes on Son are able to duck into crevices in the rocks, and the gout of flame only catches a few. (They take 2 damage.)

Ember fires down on them from above, her arrow doing a few more in.

Ember will shoot an arrow into the swarm of centipedes, now that she is comfortably atop a rock and guarded by Big 'Un and her other companions.

Attack (no mod): 19 

Damage: 2 

Blue continues trying to eat them.

Attack: 5 Damage: 9

((I should have looked before rolling, sorry. Also should have just stabbed them!))