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She raises a hand to signal to the others that she's convinced the giant and the battle with the wyvern is on and draws her sword and shield. "Now, would you mind giving me a lift up to beast? I go up, it comes down!" 

Initiative roll: 26 when needed

If Aralia is speaking to the group with the last question, Abishai will walk up to her while playing his instrument, place his hand on her shoulder, and say, "Easy enough."

[[ OOC: Abishai casts fly using his Doss Lute on Aralia, giving her 10 minutes of flight speed while he concentrates on the spell. ]]

If he doesn't understand the conversation, Abishai would then simply aim a mote of energy at the wyvern to kick things off.

[[ OOC: Abishai casts Starry Wisp at the wyvern. Attack: 14 to hit for 7 radiant damage if it hits. ]]

((She was still speaking Giant, so Starry Wisp it is.))

Silvosh will mark the wyvern as her target  (hunters mark) and send a couple of arrows flying at it.

Attack 18, damage 4 piercing + 4 force

Attaqck 23, damage 11 piercing + 5 force

Ssha stands next to and just in front of aralia and silvosh,

bathing the long ranged attackers in his aura of protection. 

he watches the fireworks as he and his melee weaponry would not do much against the flying wyvern. he holds an action to strike at an enemy that might fly by or come toward them with his halberd (range 10ft) pulled from his back in his two arms now, as a calm grin holds back the raging tides within.

Init: 16

Wendell will launch a fire bolt at the wyvern, not knowing what was discussed in giant (having not cast comprehend languages) but agreeing with what he assumes the others to be thinking which is remove the flying creature first, as a mobile target is more dangerous.

Attack: 22 damage 17 fire damage

Init: 8

Abathax will throw the Javelin he has in his hands following it up with the casting of Hellfire.

Javelin: to hit 27 for 8 piercing dmg and as I assume this hit I can place a seal on the Wyvern (I just noticed I misread a feature, therefore, this should be 22 for 3 dmg (str, can't use charisma which I thought I could)
Hellfire: DC16 Charisma save or take 5 necrotic and 5 fire damage.

((Hellish Versatility to replace one attack with a cantrip, 
Due to my misread I should change my javelin's and warhammer for dex weapons ^^))

[For the purpose of easier play, I'll be using side initiative this campaign, so in this battle the party goes first, and then the monsters! Also I don't think there should be any need for a battle map in this encounter as it's a single enemy in open terrain]

Abishai kicks off the fight by launching a mote of glimmering energy at the wyvern, which just manages to hit it's neck as it circles around the Giant, alerting it to further threats below. Silvosh then locks onto the beast, firing two arrows that land firmly in it's skull and hind leg respectively, magically enhanced to deal extra pain! Ssha simply prepares for an attack from the wyvern if it comes close enough to target, whilst Wendell releases a potent burst of flames that soars through the air into the wing of the beast. Finally, Abathax throws his javelin up in a great arching throw that results with the tip of the weapon poised perfectly into the monster's back, then he tries to strike it again with a plume of hellfire [DC 16 Charisma Save against 5 necrotic and 5 fire damage: 5]

Status
Hugnar the Hill Giant: Full Health
Wyvern: -56 Health, pending DC 16 Charisma Save against 5 necrotic and 5 fire damage

The wyvern succumbs to Abathax's licking flames and has it's hide both burnt and ravaged as the necrotic energy of the fire sucks the life out of it's scales. It already seems to be quite wounded so early into battle, though that isn't a surprise considering your power. 

Just Aralia's turn is up before the monster's turns!

Status
Hugnar the Hill Giant: Full Health
Wyvern: -66 Health

Assuming Hugnar tosses her up so that she is in melee range of the wyvern, Aralia with swing at it with her longsword. Hopefully he also catches her on the way down.

Action: Longsword to hit 15, damage 7 psychic + 17 (actually 19, missed 1 d8) force damage from Eldritch Smite and wyvern should be knocked prone.

[Hugnar hasn't tossed her up quite yet, but she can hold her action until he has, so...]

Aralia prepares to strike the wyvern for when Hugnar throws her up, which he does, sweeping her into his colossal fist and tossing her 15 feet up to the level of the wyvern, and at the apex of her flight, she releases her held action and slashes through the beast's neck, her weapon pulsating with raw eldritch power that both blasts the wyvern to the ground and wreaks such psychic havoc on it's mind that it's flight path is diverted directly into the ground. As it tumbles off-course down into the floor, Hugnar then catches Aralia once again and places her down, the wyvern's damaged body throwing up the grassy turf that coats the hills as it is driven into the ground a few feet by it's fall, ending up flat on it's back and perfectly within striking distance of Ssha, who can unleash their prepared attack!

Hugnar: Action: Throws Aralia 15 feet up.
               Reaction: Catches her.
               Free Acttion: Puts her down. 

Status
Hugnar the Hill Giant: Full Health
Wyvern: -90 Health, prone, Pending Held Action from Ssha and 6 bludgeoning damage from it's fall.

[I didn't expect this to be such a thrilling (and technical) fight, but since the wyvern's within striking range of Ssha, I'll let them take their held action first before taking the wyvern's turn, if it's still even alive by then!]

Status
Hugnar the Hill Giant: Full Health
Wyvern: -96 Health, prone, Pending Held Action from Ssha

Ssha takes a half efforts swing of halberd at the wyvern, “my poor serpentine friend… this is really not your day…” he toys with it a bit, in the distracted state missing (11 to hit, 9 slashing dmg) 

he is surprised at the wrestling moves displayed, happy to know he is surrounded by at least semi competent Allies in this hunt…. He will decide later if it is their patron he is to thank, or each individual hero/heroine. 

Ssha's heart is not in it and his aim is obscured by the spray of dirt from the wyvern being floored, so his halberd swing misses. The wyvern then hauls itself round and out of the crater, the arrows and javelins in it's side splitting against the rough debris, and just manages to launch it's body off the ground, spreading it's scaly wings and preparing to attack. It soars towards Hugnar, and tries to cut the bundle of enormous berries free with it's claws, then flies around the Giant's waist to his other side, perfectly within reach of it's main assailant, Aralia. It seems to have processed that it is on it's last legs, and so now is fuelled by adrenaline and rage to at least wreak some havoc upon it's attackers before it ultimately perishes, swinging it's stinger down towards the tiefling.

Wyvern: Multiattack: Attacks Hugnar's bundle with it's Claws: 14 to hit, 14 slashing damage on a hit
                                     Attacks Aralia with it's Stinger: 24 to hit, 13 piercing damage on a hit and Aralia must make a DC 15 Constitution Save
                                     or take 32 poison damage, half on a successful save.

Status
Hugnar the Hill Giant: Full Health
Wyvern: -96 Health

Aralia Con save: 14

The wyvern's claws just manage to swoop past and tear the knot holding the cloth bundle to tatters, the fabric unravelling and the four massive berries inside tumbling free to land on the dirt, and whilst it's a heavy fall, the combination of the softer, freshly upturned ground and the thick skin of the berries mean that they do not suffer much damage from the fall. The wyvern's stinger then also manages to pierce through the links in Aralia's chain shirt, who not only suffers the effects of the puncture wound, though it's mainly masked by the false life she cast on her self earlier on, but also feels a rush of toxins flooding into her system which she cannot fight back against.

[I've taken both the damages off of her sheet already, so no worries about having to do that!] 

The party is now back up!

Aralia tries casting vampiric touch to steal health from the wyvern to make up for the heavy damage she's taken, but in the delirium from the poison she is unable to make contact.

Action: vampiric touch, to hit 12

Ssha pulls a javelin and sighs, “I guess there is use in such weaponry…” he prefers his halberd and maul, his longsword and shield…

”for the alliance! And our patron!” *throwing with his brutish might* 

27 to hit (crit)

12 piecing dmg 

After Aralia misses her spell, Ssha throws his javelin with perfect precision, it's thin wooden shaft spiralling through the air in a fluid and targeted motion, before firmly landing directly into the eye socket of the wyvern, a plume of blood splattering the battlefield to signify the weapon's arrival. The wyvern gives an awful screech, and begins to thrash about in the air, convulsing and clawing at nothing as it fights to stay alive and airborne throughout the searing pain across it's body. It is clearly fatigued from battle, it's body almost completely destroyed from the combat it has endured, and it seems that even the slightest nick of a dagger would cause enough shock and sudden blood loss to end the wyvern once and for all.

Everybody but Ssha and Aralia are still up! 

Status
Hugnar the Hill Giant: Full Health
Wyvern: -108 Health

Wendell will try and drive some psionic energy into the wyvern (mind spike). DC15 Wis save or 14 psychic damage (halved on success)

Wendell is well aware this is likely overkill. But he also knows that this spell is potent enough that it should end the wyverns suffering regardless of how strong it's mind is. 

Wendell strikes at the wyvern with a remote, magical shock of mental pain, though with the wyvern's current condition he'd imagine that the beast barely processed what was happening before it's mind simply gave way and passed on without an attempt to fight back. The corpse of the wyvern falls down in a tattered spiral mid-air, and lands with a thump on the hillside, though with far less resistance as previously. Hugnar cheers and almost immediately wallops the head of the wyvern with his club in celebration, causing a great splatter of bone, splintered wood and a slurry of red, goopy paste to stain the grass beneath it. He then leans back to pluck three of the four halfling-sized berries of the ground, keeping them held in his gargantuanly sweaty palm and leaves a lone, glittering blue fruit for you. Aralia hears him say 'Thank you small people. Hugnar is very grateful, and hopes to see you again in the next time.' He then simply strides off, his footsteps leaving great impressions on the hills as he wanders into the distance, away from the path linking the towns and closer to the untamed wilderness of the county's outskirts, unless somebody calls back to stop him or acts otherwise.