Was not sure about the size of the square. If it's 5 feet, Erky will move to the square between Ireniana and the pit. So, Cure Wounds 7 on Iereniana and as a Bonus action - 7 heal on Kastix. (Ron should be attacking already)

Kaylyn narrows her eyes and refocuses as she let's the energy fly again towards the Troll. 

Attack: 11 Damage: 8 + Bless 2 Cantrip - Eldritch Blast

At the same time she points her other hand at Irenaina and she is briefly bathed in white light and receives some healing.

As a BA uses Healing Light to heal Irenaina for 4

(OOC: I'll post Ireniana's attack of opportunity first)

Irenaina attack of opportunity - Attack: 18 Damage: 6

Ireniana feels the troll's attack and says," That stings a bit." For a bonus action, she will use Second Wind.

4

She will run up to the troll and make a regular attack.

Attack: 22 Damage: 4

She will use Action Surge to swing her sword at the troll.

Attack: 22 Damage: 6

Rhayna heals Ireniana with Healing Words (8). She will also cast Sacred Flame on the Troll. (4)

(Sorry for the delay)

Turn 2 combat:

It's mayhem in the burial chamber, with swords, claws and spells flying, as the giant creature attempts to lift the fallen tiefling to its jaws to sate its centuries-old hunger. A beam of holy light from above and a blast of bolt of eldritch energy from the side strike the troll just as Royan and Ireniana's blades bite into its back, and it howls in pain as new wounds open up, oozing thick black fluid.

The troll drops Kastix to the floor and turns to face its assailants, reacting in time to avoid another beam of radiance from Oghma and a bite from the giant weasel. Almost in unison, Rhayna and Erky speak sacred words of healing. Ireniana feels her claw-wounds staunched, and Kastix regains consciousness, after which he promptly runs to take cover behind Royan's shield.

Feeling the persisting bites from Ireniana's swords, the troll turns to face her, slashing out again with it's claws. The nimble elf manages to deflect the blows with her swords, but the giant weasel takes the trolls massive talons right through its torso, and its bowels spill onto the floor as it falls into a heap with a pitiful gurgle.

New positions:

Ireniana has been healed for 8hp (back to full)
Kastix has been healed for 6hp (back to full)
Ron is dead. Seeya Ron.

NOTE: Rhayna's Healing Word put Ireniana back to full HP, so I have replaced Kaylyn's Healing Light and Ireniana's Second Wind on their character sheets. You can both declare an alternative Bonus Action for Turn 2 if you wish (include Hex for Kaylyn if you want, as you have only cast Eldritch Blast so far in Turn 2)

Royan pushes Kastix behind him as he gets up from the ground he then lunges again at the Troll with his longsword, his fury expressed in a cry of rage that throughout the chamber. As he yells at his foe, Royan abandons all of his training and attacks recklessly. 

Attack: 18 Damage: 9

Ireniana once again slices at the troll with her short swords.

Attack: 8 Damage: 9

Attack: 24 Damage: 4

Kastix will disengaged and move behind Rhyana to the corner spot.

Erky sighed and reached out for the next boll (he was getting used to it). The boll rolled towards troll turning into 5 Black Bear . That was better. At least it looked like something better. "Attack", not without sadness in his voice ordered Erky.

Rhayna puts herself in front of Kastix. She brings her pendant high, towards the Troll. “Begone monster!!” She casts Guiding Bolt on the Troll.

Attack: 25 Damage: 12

Round 2 BA

Kaylyn's eyes fill with a bright light as she calls on more power,

"Return to your rest foul beast." As she casts Hex for an additional 5 necrotic damage.  Also the target has disadvantage on ability checks made with Dexterity 

Round 3

"Kastix!  More fire!  Burn the monster!" Kaylyn yells as she sends more Eldritch energy at the troll,

Attack: 23 Damage: 15 radiant + 5 necrotic.

"Like you need to tell me that!" Kastix yells as he comes to a stop, "If you want a lot of fire, either get people of the way or its just bolts! I'm not getting closer for sure!" 

OOC: I've already disenagegd as his action for this turn so wait til next turn for bolts. 

"Bolt's are fine, just start burning it." She calls back to him

Kastix's altered turn. 

"Ignis!" Kastix fires a few bolts into the troll corpse, "There's your damn fire! This thing must have had some good gear, someone should carefully check the coffin," Kastix leans against the nearby wall and stumps down while taking a few deep breath from his near-death experience. 

Attack: 26 Damage: 6 Fire

26 if I have advanatage aginst the troll's dead body.

Having overcome their initial surprise, the heroes seem to have the measure of their opponent. Once again, from opposite corners of the room, blasts of energy - both holy and arcane - slam into the troll, visibly weakening its movements. The furious swings of Royan's sword, and the more subtle flashing thrusts of Ireniana's take their toll on the beast, and it collapses to the floor with a sickening gurgle, black blood oozing out of its wounds and across the marble tiles.

With the troll on the ground, I'll give Erky and Kastix the opportunity to change their actions if they wish. Kastix is still beside Royan and the troll, and Erky is yet to summon the bear. I also again withheld Ireniana's Second Wind.

I think Black Bear can follow us, just in case.

"Can anyone check the coffin for things?" Kastix asked from his seated position as he massaged his bruised everything. 

(LOL. I almost didn't see your altered turn, and was gonna have the troll get back up while everyone relaxed. Yes, seems silly to 'miss' a corpse. Consider it dead)

As the troll's black blood oozes across the floor, Rhayna notices that it doesn't pool in the southwest corner as expected, but seems to drain into some cracks surrounding several marble tiles.

The troll is wearing two silver rings. It's faded and threadbare robe was ripped off during the fighting, but was clasped with a ruby-studded gold brooch.

The interior of the coffin is padded in plush velvet, and sprinkled with rose petals, all of which seems untouched by time. Numerous coins are scattered across the base of the coffin (220 sp and 50 gp) all imprinted with the face of a dragon. Nestled within the sarcophagus are several items that glow with a distinctive aura under Kaylyn's magical sense:

- a shortsword with highly stylised dragon motifs
- a wickedly-curved ornate dagger
- a golden amulet featuring two hands cradling a sun
- four scrolls inscribed with holy spells

"Let take the body, dump it back in and sealed up," Kastix stated as he stand up. holding his midsection, "Probably get a room with the kobolds and check out our spoils in greater details,"