Opportunity attack results in order of attack. 

1. The bear slashes the beast with his claw.
2. Velmine hits the beast, but instead of dealing damage, it looks healthier. 
3. Eiren hits the displacer beast 
4. Baik also hits him with a powerful blow, but the beast somehow eluded most of the damage such a strike should have dealt. 

 Then Tallis runs up and makes two attacks. The first hits, followed by a second successful attack. (All attacks against DB1 are now normal until the end of his turn.) But like Velmine's attack both of Tallis' attacks seemed to strengthened the displacer beast. 

Tallis you still need to let me know which square you are in.

 Qu'oth is up 

Followed by Corvin (Corvin can act before Qu'oth if you see the post first)

Qu’oth moves in to help Eiren with his attack, flying in the displacer beast’s face as a distraction and crowing loudly.

Quote from Flyingmatthew >> 

 Then Tallis runs up and makes two attacks. The first hits, followed by a second successful attack. (All attacks against DB1 are now normal until the end of his turn.) But like Velmine's attack both of Tallis' attacks seemed to strengthened the displacer beast. 

Tallis you still need to let me know which square you are in.

 (U17)

 Corvin turns to hammer at the displacer beast between himself and the wall.

Attack: 24 Damage: 12

Damage if it fails spirit guardians save: 18.

Corvin is a little off his game, because he missed the displacer beast. 

 Xavier is up 

Xavier fires off a fire bolt at the beast. 

Attack: 25 Damage: 3 Fire damage

Xavier's firebolt lands a scorching hit on the remaining displacer beast. 

Eiren is up 

Eiren chases the displacer beast, trying to take out its legs with his rapier of warning as it runs away.

“Cut off its escape!” He calls out, sounding exhausted. “Or stop whatever you’re doing to make it run away! Let’s finish it quickly.”

Attack 1: 14 Damage: 13 piercing

Elven Accuracy reroll (for the lowest die): 16

Attack 2: 25 Damage: 14 piercing

Quote from Awaypturwpn >>

Eiren chases the displacer beast, trying to take out its legs with his rapier of warning as it runs away.

“Cut off its escape!” He calls out, sounding exhausted. “Or stop whatever you’re doing to make it run away! Let’s finish it quickly.”

Attack 1: 23 Damage: 12 piercing

Elven Accuracy reroll (for the lowest die): 14

Attack 2: 25 Damage: 12 piercing

 Which square did you move to?

Eiren moves to T15

Eiren with help from Qu'oth makes two stinging strikes with his rapier. 

Velmine is up 

After seeing her rapier doing the exactly opposite of what it was supposed to, Velmine looks at the weapon curiously. "Hm, it might be broken..."

Not completely sure what happened, but determined to not let it happen again, Velmine sends the bear in before she comes. The bear stops in (U-V, 13-14) and unleashes a round of attacks.

Bite Attack: 21 Damage: 5 Piercing

Claw Attack: 9 Damage: 8 Slashing Wisdom Save: 6

 Seeing the bear's attack looking like a success, she rushes to do her own attack, standing in W14 and using her rapier.

Attack: 9 Damage: 24 Piercing 1d10: 10

Velmine's Wisdom Save: 5 (Jeez, these wisdom saves suck, I'm not complaining about the fact they're happening, but I can't roll past 10...)

The bear successfully attacks with both his claws and teeth, Velmine rushes forward and misses with her rapier. 

Velmine's Wisdom Save: 7 (Jeez, these wisdom saves suck, I'm not complaining about the fact they're happening, but I can't roll past 10...)

It's not to bad yet. In my other game one of my players (a sorcerer) can barely hit anything with his firebolt. We started at lv 1 and are just leveling up to 3, and U believe that his firebolt has only hit 3 or 4 times. It has gotten so much of a joke that he is using a crossbow that has a lower attack bonus (and the crossbow is working).

Baik is up. You will have to go to T16 if you want to make a melee attack. Regardless what you do remember to give me the square number. 

Baik moves to 14U and once again lights up the beast, seeing how the attacks aren’t really doing much.

DC16 dex save or 9 fire damage

Quote from BoboBoombang >>

Baik moves to 14U and once again lights up the beast, seeing how the attacks aren’t really doing much.

DC16 dex save or 7 fire damage

 14U is taken by the bear, move somewhere else or stay where you started. Bonfire has a 60' range so you don't have to move if you don't want to. 

Displacer beast Dex save 3

I can’t really get into melee range then (that’s why you said that space) do I’ll l just sit put.

Quote from BoboBoombang >>

I can’t really get into melee range then (that’s why you said that space) do I’ll l just sit put.

 You can get into melee range if you move through friendly squires and go to T16, but since you cast Bonfire you can stay there or move somewhere else that isn't occupied. I'm going to assume you still where you are if I haven't seen a reply when I start making the updated map in a few hours. 

DB1 Wisdom save 11. Corvin's gaurdians deal a little more damage. 

The displacer beast still running from a terrible few squeezes through the gap between Eiren and Tallis. Triggering a host of Opportunity attacks.

(Squeezing into a Smaller Space A creature can squeeze through a space that is large enough for a creature one size smaller than it. Thus, a Large creature can squeeze through a passage that's only 5 feet wide. While squeezing through a space, a creature must spend 1 extra foot for every foot it moves there, and it has disadvantage on attack rolls and Dexterity saving throws. Attack rolls against the creature have advantage while it's in the smaller space.)

So all attacks against him will have advantage as this is still his turn (the disadvantage resets at the end of his turn.)

Velmine, Bear, Corvin, Eiren and Tallis all get Opportunities attacks (in that order, but in reality just post when you read this.) Velmine give me another 1d10 after your attack 

Assuming that he survives the assault here is the map after his turn. 

Scared that she might heal the creature again, Velmine holds back her weapon, and does not take an attack of opportunity, the bear, though, is commanded to attack with its claws.

Bear Claws Attack: 18 Damage: 13