Dreams Into Journey

After the harpy's attacks bounce off of Lia's shield, she covers her escape from it by conjuring a dagger behind it, which delivers a heavy blow (11 force damage).

Oswin, now aware of the situation he finds himself in, instructs his metal companion to strike just as he does. While it is able to see the construct's attack just in time, it created an opening for Oswin to stab it with his spear (8 piercing damage).

Valentia, while keeping an eye on the nearby harpy's movements, directs her spectral weapon to attack the harpy harrying Oswin again. It strikes true, the hapry reels from the attack, struggling to stay upright (11 force damage).

Harpys' turn

The gravely wounded harpy, feeling its wounds, spread its wings and begins to lift off of the ground and fly from the scene, using the slope of the ravine to try to gain speed to lift off) (Oswin and his SD can take an opportunity attack as a reaction).

The harpy by Oswin's steel defender, feeling the need to finish what its fleeing friend had started, move to attack both Oswin and his automaton.

Claw (to Oswin) Attack: 17 Damage: 5

Club (to SD) Attack: 19 Damage: 3

The winged monster's claws were not able to get through Oswin's heavy armor, but its club rang out, sound further damage to Oswin's metal protector (SD takes 3 bludgeoning damage).

Angered that one of its prey had not only escaped, but also gave a parting blow, the harpy near the trail takes its frustration on Valentia

Claw Attack: 10 Damage: 5

Club Attack: 21 Damage: 3

While the harpy's claws were unable to find purchase though the Kelemvor follower's protection, its club was able to impact with moderate force (3 bludgeoning damage)

End of round 2

Begin round 3

Map:

 Everyone can take their turn

Lia has her spiritual dagger strike again...

To hit: 23
Damage: 6

She then will shoot with her crossbow. If the one she struck with her spiritual dagger is down she will shoot the one trying to fly away from Oswin. If that one also is down she will att the one by Oswin's steel defendor.

To hit: 21
Damage: 9

(Did you forget to add disadvantage because of the dodge action? I'm just asking and thinking, it may have made the second attack against Valentia miss.)

Valentia lets her Spiritual Weapon swing again, this time against the harpy that just took the place of the first one in attacking Orwin and his defender.

Attack: 22 Damage: 12 Force

As for her own attack, she puts her hand out to create a Sacred Flame to envelop the fleeing one. (If it dies to the attacks of opportunity, change the target to be the same one the SW attacked.)

DC 14 Dex Save or 6 Radiant Damage.

(EDIT: I forgot to add Bless to the attack roll, but it doesn't matter since it's a nat 1. Speaking of which, here's the Saving Throw against that: 10 + 1)

(I did yes. I guess that’s what happens when I try to DM at 1 AM. DA rolls 1 22 2 18)

 (2nd one still hits)

AoO
Oswin: Attack: 24 Damage: 10
Sd: Attack: 17 Damage: 3

On their turn, same again against the one they have flanked.

Oswin: Attack: 24 Damage: 6
Sd: Attack: 20 Damage: 7

Resolving AoO

Just as the grievously wounded harpy attempts to leave the ground, Oswin thrusts his spear through its armpit. The sheer amount of punishment finally taking its toll on the winged beast as it loses all strength. As a finishing blow to it, the concussive blast from his steel defender send it limply rolling down the mountainous terrain, finally ending with a sickening crack as it strikes a sturdy boulder, splitting its skull open (13 magical piercing and force damage, and dead).

Player round

Lia's spiritual weapon takes another swing at her and Valentia's assailant. It strikes the creatures leg, causing great harm to it (8 force damage). She then follows up with a bolt from her crossbow, winging it, but drawing blood (3 piercing damage).

Harpy Dex Save: 18

Valentia's spiritual weapon makes an attack on the harpy by Oswin and nearly gets stuck in a rock. With its wits about it, the harpy also sees the radiant bolt of flame and deftly dodges.

Taking advantage of the harpy's distraction, both Oswin and his steel defender strike at it at the same time. While each individually aren't partularly damaging, their combined effects are compounded (13 force and piercing damage).

Harpys' turn

The newly injured harpy retaliates against the two now responsible for its companion's death

Claw (vs Oswin) Attack: 22 Damage: 6

Club (vs SD) Attack: 15 Damage: 3

The harpy's claws find purchase through his armor, raking his flesh underneath (6 slashing damage).

Its club also finds its mark, denting the very thoroughly punished robot again (3 bludgeoning damage).

Angered by the attacks from afar, the other remaining Harpy flies to attack Lia (Valentia can use an attack of opportunity as a reaction)

Claw (vs Lia) Attack: 10 Damage: 8

Club (vs Lia) Attack: 10 Damage: 2

In its rush for vendetta, it is unable to aim its attacks properly.

End of round

Begin round 4

Map:

 Everyone can take their turn.

Oswin will raise a magical shield to block the attack against him and then he and SD will attack again.

Oswin: Attack: 20 Damage: 11
SD: Attack: 20 Damage: 4

Valentia tries to act quickly to take the Harpy trying to flee before it manages to get too far, using her mace. (AoO)

Attack: 5 Damage: 6 Bludgeoning

After that, to the Spiritual Weapon is issued the same command, swing at the nearby Harpy (in case the harpy's already dead, the SW will just move as far as it can towards the last one).

Attack: 19 Damage: 5 Force

And finally, the last thing Valentia does on her turn is to raise her arm to cast Sacred Flame on the harpy pursuing Lia.

DC 14 Dex Save or take 8 Radiant Damage.

Lia has her spiritual dagger strike at the one following her:

To hit: 8 Bless: 2

Damage: 7

She then casts ray of frost

To hit (disadvantage due to ranged in melee): 15 Bless: 1

Damage: 4

Resolving reactions

Just as the harpy's claw reaches Oswin, an unseen barrier causes it to bounce off (no damage).

Taking advantage of the enraged harpy's brashness, Valentia manages to strike the harpy's shin (2 bludgeoning damage).

Players' turn

Oswin's mechanical friend let's lose a kinetic blast to send the harpy onto Oswin's spear (17 piercing and force damage).

Valentia's spectral weapon quickly follows up with solid, deadly force (12 force damage and dead)

Last harpy's dex save: 7

In an effort to defend Lia from the last harpy rmaining, Valentia's invoke holy fire to strike at it. Only for the harpy to evade it.

Lia's incorporeal dagger strikes at the harpy, but it is also dodged at the last moment.

Although aiming proved difficult, Lia manages to land a glancing blow with a chilly beam (1 cold damage).

Harpy's turn

The last hornet, now wanting blood, continues its assault on Lia.

Claw Attack: 9 Damage: 7

Club Attack: 10 Damage: 2

Whether if its its rage is blinding it, Lia's skill in evading its attacks, or sheer luck, none of its attacks achieves what its wants to do.

End of round 4

Begin round 5

Map:

 Everyone can take their turn.

Lia's spiritual dagger strikes at the harpy again...

Attack: 18 Damage: 6

She then goes for another ray of frost

Attack: 8 Damage: Unable to parse dice roll.

Valentia casts Sacred Flame against the harpy again and then moves into melee range (C7) to it to see if that could distract the harpy from Lia. The Spiritual Weapon is commanded to get closer (E7), but it's too slow to get in range this turn.

DC 14 Dex save or take 4 Radiant damage. (Sorry, rolled the wrong die... Instead of a d4, it should be a d8, so here's it: 2.)

(It has been more than 40 hours since Oswin's turn has been called. As a result, Oswin -and consequentially, his SD - will be controlled by me this turn. We hope you will be able to rejoin us soon)

Free of the two consecutive harpies, Oswin takes the opportunity to catch up to the final harpy (with his mechanical not far behind) and attempts to run it through.

Spear Attack: 19 Damage: 11

The spear pierces through the last winged monster through its heart. It's strength completely exhausted, it's form falls limp and broken (11 damage and dead)

You are now out of initiative.

Lia begins searching the harpies and, if she can find it, their nest.

Investigation: 9 guidance: 3

Lia searches the corpses of the harpies and finds some beads on the first harpy that was assaulting Oswin and the one accosting her. Possibly trophies of previous kills.

She then uses the trajectory of the harpy that tried to extrapolate where they are possibly nesting to conclude that they most likely had come from a mountain to east.

Roll a nature check.

Lia nature: 13 guidance: 2

Lia knowa some basic information about harpies:

While harpies do not have the same sense of society as most sentient species. They are known to gather in quasi-tribal communities that can be as small as a half-dozen.

As these harpies seem to have been a small hunting group, it is unknown how small, or large, their nesting grounds are.