Nasaar shoots another with his crossbow...
Attack: 13 Damage: 5

Three more orbs burst and they still continue their slow advance.

( 20 feet up and away.)

(How many are left?)

Kastor continues his fiery assault with another Fire Bolt and Flame Seed attack.

Attack: 22 Damage: 7

Attack: 19 Damage: 7

(Would also like to know numbers of enemy...)
Crossbow attack...
To hit: 5< br /> Damage: 5

(A lot)

Two more orbs burst, their pollen coming near the party's feet.

(Guess we didn't really understand how many of those things there were to start with... If we had known there were a lot, which does that mean ten more or 50 more? We probably would have done this differently.)

Nasaar glances to the others. "Maybe we better make a run for it..." He suggests, thinking they might be able to get under the globes before they seal off the way forward or something.

Rusty will proceed to the exit and fire again with his handbow.

Attack 23 Damage 5

Yeah, that information definitely changes things.  Are they blocking our escape route?  Or behind us, following us out?  Or above but surrounding us?

(Ahead and above)

Rusty bursts another orb and its pollen hits the party.

Con Save, DC 18, take 9 poison damage on fail. Half damage for Sylvester, Rusty, Axon and Sylvester has advantage due to class.

Axon Con Save: 18

Kierran Con Save: 9

(Has my Readied action finally gone off and failed? So I can make another attack?)

Con ST: 3

(Okay...fine then, dicebot)

Con Save 18

Kastor CON save: 23

Kastor will call out, "Run!" and will rush forward until he's almost underneath the first orbs, at which point he'll cast Thunderwave at first level, aiming upwards towards them. Each orb within a 15ft cube from Kastor must make a DC14 CON save or suffer 11 Thunder Damage and be pushed 10ft away (and higher). In addition, Kastor is hoping that any pollen would count as "unsecured objects within the area of the spell's effect" and would also be pushed 10ft away, falling harmlessly away from the group. 

(They never got low enough to attack with your sword.)

 (The spell would work at pushing the current pollen away, but you'd create more pollen when those hit by the spell die. The burst is more of an after effect and Thunderwave is not a continuous wave but rather instantaneous burst. So the spell will push the other pollen away but you'd cause more bursts. And by with how many, that'd be 15d6 damage to the whole party. And I'd up the DC considering you all would be covered in spores. So I advise something else than that.)

Then Kastor will just run and dash underneath them. 

Nasaar con save: 17

Nasaar makes a rush forward, trying to get under the globes and out the other side. (Again, not sure if this is possible, as you have not told us if there are ten or fifty of these things, nor how far it is to get past them...)

Rusty seeing the group attempt to escape will make a Dash for the exit.

(Um, I...did roll my Con ST? And nat 1ed?)

Hari will follow the group to Dash for the exit, casting cure wounds on herself first because she's at 5 hp.

CW: 10

(The party decided to fight so I didn't put it in. It'll take two rounds to leave. This round gets you to the intersection.)

 The orbs were coming from one of the passages at the intersection. Nasaar can remember, from his familiar, that the passageway was filled with them. 

(And I'm going to roll for Sylvester if he doesn't post soon. Hari, you should have been full health since the party took a long rest after the mob fight.)

Sorry been busy

 Con: 11

Sylvester will follow suit in trying to escapes and use his cunning action and action to dash to keep up with the group

 (Alright, so I'm assuming the party will just keep running then?)