Stormraider Keep (A M.E.T.A.L. Campaign)

Duel save is WIS DC 15

Flynt gets off shot.

Attack: 17 Damage: 20

Attack: 20 Damage: 18

(Seconf shot is a Bonus action)

can i join you mission please?

Aurelius manages to hit the oni with his swing but it seems to do minimal damage to the cloud.  His first eldritch blast hits well, but the second misses. 

(Niikag WIS Save: 16) 

Flynt's first attack also hits, while the second misses. 

(Elyria is up.) 

Elyria quickly uses her forest magic to cast Dispel Magic on Niikag, trying to force him back from his cloud form, still maintaining the Faerie Fire on the cloud.

With Elyria's spell, the cloud turns back into an oni, now floating 10 ft. up in the air. 

Niikag then flies another 30 ft. upward, now 40 ft. above you.  He then casts Darkness, centered just below his location. (15 ft. radius, so it encompasses him.)  The Faerie Fire is dispelled.

(Aurelius is up next, then the next round starts with Flynt then Elyria.) 

The paladin will cast hex as a bonus action on the Oni (no save, DA on WIS rolls), followed by two beams of eldritch blast as an action.

First blast Attack: 18 Damage: 9 magical force + 4 necrotic damage

second blast Attack: 17 Damage: 3 magical force + 2 necrotic damage

Both of Aurelius' blasts hit, but still do not seem to take down the oni. 

(Flynt is now up, followed by Elyria.) 

(does it need to make concentration rolls on the fly spell?)

Wanting to keep the pressure but doubting how effective they will be, Flynt draws Betsy and snaps off three shots.

Attack: 21 Damage: 18

Attack: 21 Damage: 19

Attack: 5 Damage: 20

Quote from rob88scps2 >>

(does it need to make concentration rolls on the fly spell?)

 There is no spell. So no.  There should be for Darkness:

(CON Saves: 9, 12)

 The Darkness ends.

Elyria quickly uses her forest magic to cast Dispel Magic on the Darkness, hopefully revealing the oni again.

(I cannot see if Flynt rolled at Disadvantage. If you did,  you may adjust the results to keep 1st roll.)

Seeing the darkness dissipate Elyria fires an elven arrow at the oni after cursing it (Hex, dex).
Longbow: 20 Piercing: 6 Necrotic: 1

(I did not. My appologies. But anything worse would still be no good so just keep these rolls.)

All three of Flynt's shots sail past Niikag as does Elyria's arrow. 

The oni continues flying up and now away from you. (Total distance 70 ft. away.)  He casts Invisibility on himself and disappears from view. 

(Attacks would be at disadvantage at this point. Aurelius ends the round then Flynt followed by Elyria are up if you wish to try anything.) 

(Flynt's out of tricks.)

Swearing colorfully, Aurelius runs towards the last known position of the Oni.  He will again fire two eldritch blasts to where he last saw the creature, hoping to break its concentration.  "

First blast Attack: 9 Damage: Unable to parse dice roll. magical force + 4 necrotic damage

second blast Attack: 8 Damage: 2 magical force + 1 necrotic damage

(What is Yoë  doing?)

Both of the blasts from Aurelius seem to strike a target. 

(CON Saves: 11, 20)

The target remains invisible however. 

(Elyria is up next.) 

Fearing the oni is about to escape Elyria uses her forest magic again to try to dispel the magical effects on Niikag.
Dispel Magic, hopefully dispelling both the flying and the invisibility.