Nate is going to move out and stay glued to the northwest wall about 20 feet into the room. Basically where Nub is, but on the other side of the entrance. He is waiting ready to come to his comrades aid should they need it, and stays light on his feet in the meantime. He's also giving the room for Blagothkus et. al. join the fun.
This post has potentially manipulated dice roll results.
Dragon's CHA save: 23 Jalt, you feel the power of this foe and your spell fails to take hold.
At this point, the dragon will use two legendary actions; it beats its two massive wings down, and again, and a final thrust down driving the air in a massive storm against you.
Those are both fails, I'm afraid. Soar and Jalt are unable to maintain their balance in the face of this powerful force of wind. You both take 13 bludgeoning damage as you are knocked prone.
The dragon takes off, flying up forty feet. Jalt and Soar can both use reactions to make Opportunity Attacks, though with disadvantage as you are prone. Let me know if you take the Opportunity Attack or not.
It's a miss from Soar, but a hit from Jalt, only just, but the pick tears a little into a flapping wing and creates a painful-looking hole. The dragon rises, ending about forty feet above you and a little to the north-east of where it started.
The two stone giants are taking their cue from Blagothkus, and also remain in the tunnel, waiting to see what happens.
Round Three: Blagothkus Glazhael the White Dragon Soar and Nub Jalt and Nate Wiglof and Hulda
Now the cloud giant does finally stomp out of the tunnel, and look up to the flying dragon above. He smiles at the bloody gashes that Soar and Jalt have inflicted. He mutters something to himself in Giant, and then touches a huge hand to Jalt. Jalt, you feel the Fly spell take effect, giving you a flying speed of 60 feet.
The dragon maneuvers in the air, takes in a deep breath, and breaths a wall of cold ice and frost that fans out in a huge cone, catching Soar, Jalt, Nub, Nate and Blagothkus.
Everyone please make a CON save, DC is 19. On a failed save and if you don't have resistance to cold damage, you take 51 cold damage. So that's 25 if you fail but have cold resistance, 25 if you succeed and don't have cold resistance, and 12 if you succeed and have cold resistance.
Blagothkus CON save: 15 The giant still seems not too badly hurt. Let's resolve the CON saves before moving forward.
Shaken from the cold blast, you all four nevertheless remain on your feet.
With that, the dragon uses the remainder of its movement to slam into the ice walls that make up the side of the cavern, and it burrows into them. It's not clear how far it's gone, but you cannot see it from where you are.
(On the map, I've marked the start of the hole where the dragon disappeared, as a green line. It's forty feet up in the air from the ground, and perhaps thirty feet above Soar and Jalt who are standing on the treasure mound.)
This post has potentially manipulated dice roll results.
Nub points up at the hole with his own finger, not the staff, squinting. "Let's see if this works..." and he casts fireball for 31 fire damage. The point he's going for is 20 feet inside the tunnel, straight in, hoping to account for any turns or twists the dragon may have taken in the 20' radius.
-----
Soar CON check: 19 to hopefully gain 3 temp hp back at the top of her turn if heroism is still active (if it's not, and she sees the dragon, she'll use her bonus action to cast hex with her warlock slot, giving the dragon disadvantage on STR saving throws, though I suspect this won't work with a held action and when Soar might see the dragon)
Soar steps forward and races to the top of the pile, right under the new burrow hole. She looks back at Blagothkus and, after a quick glance at the floating Jalt says, "can I get a lift too? I'm not bashful, grab me and toss me up there if you can! We can do this!"
She is walking stiffly, after getting thrown across the ground and then frozen by the cold blast, and looks briefly at Nate, wondering if he'll join the fight, or if his PTSD has kicked in. "You are stronger than your fears, bigger than your trauma, my friend," she says to herself. "This is your chance!"
Since she's not sure where the dragon went, she channels some eldritch blast energy down her blade, ready to shoot straight at the dragon if she sees any part of it this turn.
Soar succeed at her CON check, and Nub's fireball flies into the new tunnel mouth and detonates, though it's not clear if the dragon was caught or not.
Blagothkus looks at the tunnel mouth and nods in response to Soar's words.
Nate catches Soar's glance and then also walking quite stiffly after that cold blast he scurries up towards Soar, directly to her southwest. "Did you SEE that?! Where did it go? I'm not sure I can take another blast like that..." Nate kind of looks defeated in this split moment, looking around at the cavern and the giants and all of the treasure and the hole that the dragon smashed in the wall and tries to muster up some confidence. He'll grab on to Soar's wrist and says "Let me help."
Jalt will cast Beacon of Hope on him and his friends. He then will use his new found skill and fly up to just outside the hole in the wall and hold there as he tries to get a good look at the hole.
Rollback Post to RevisionRollBack
Hoard of the Dragon Queen - Jalt Rhogar - Dragonborn Cleric (9)
This post has potentially manipulated dice roll results.
Jalt, you see down the hole to the furious and seemingly cornered form of Glazhael, who glares back at you from about twenty feet away.
Hulda and Wiglof move into the treasure chamber, but there's no much they can do as the dragon is out of sight.
Round Four: Blagothkus Glazhael the White Dragon Soar and Nub Jalt and Nate Wiglof and Hulda
18
Blagothkus, as requested, picks Soar up and places her into the tunnel. Soar can now see the dragon, and her two Eldritch Blast shots fire, one hitting and one missing. That's the cloud giant's full turn, though.
Nate is going to move out and stay glued to the northwest wall about 20 feet into the room. Basically where Nub is, but on the other side of the entrance. He is waiting ready to come to his comrades aid should they need it, and stays light on his feet in the meantime. He's also giving the room for Blagothkus et. al. join the fun.
Dragon's CHA save: 23 Jalt, you feel the power of this foe and your spell fails to take hold.
At this point, the dragon will use two legendary actions; it beats its two massive wings down, and again, and a final thrust down driving the air in a massive storm against you.
Soar and Jalt, please make DEX saving throws.
Soar non-dextrous saving throw: 18
13
Hoard of the Dragon Queen - Jalt Rhogar - Dragonborn Cleric (9)
"Ive heard it both ways."
Those are both fails, I'm afraid. Soar and Jalt are unable to maintain their balance in the face of this powerful force of wind. You both take 13 bludgeoning damage as you are knocked prone.
The dragon takes off, flying up forty feet. Jalt and Soar can both use reactions to make Opportunity Attacks, though with disadvantage as you are prone. Let me know if you take the Opportunity Attack or not.
Soar will take her AoO, with the dragon leaving her range.
Attack: 27 Damage: 16
Jalt will swing his might war pick in an attempt to get a piece of the dragon
Attack: 18 Damage: 9
Hoard of the Dragon Queen - Jalt Rhogar - Dragonborn Cleric (9)
"Ive heard it both ways."
It's a miss from Soar, but a hit from Jalt, only just, but the pick tears a little into a flapping wing and creates a painful-looking hole. The dragon rises, ending about forty feet above you and a little to the north-east of where it started.
The two stone giants are taking their cue from Blagothkus, and also remain in the tunnel, waiting to see what happens.
Round Three:
Blagothkus
Glazhael the White Dragon
Soar and Nub
Jalt and Nate
Wiglof and Hulda
Now the cloud giant does finally stomp out of the tunnel, and look up to the flying dragon above. He smiles at the bloody gashes that Soar and Jalt have inflicted. He mutters something to himself in Giant, and then touches a huge hand to Jalt. Jalt, you feel the Fly spell take effect, giving you a flying speed of 60 feet.
5
The dragon maneuvers in the air, takes in a deep breath, and breaths a wall of cold ice and frost that fans out in a huge cone, catching Soar, Jalt, Nub, Nate and Blagothkus.
Everyone please make a CON save, DC is 19. On a failed save and if you don't have resistance to cold damage, you take 51 cold damage. So that's 25 if you fail but have cold resistance, 25 if you succeed and don't have cold resistance, and 12 if you succeed and have cold resistance.
Blagothkus CON save: 15 The giant still seems not too badly hurt. Let's resolve the CON saves before moving forward.
CON Save: 12
Jalt takes 25 damage
Hoard of the Dragon Queen - Jalt Rhogar - Dragonborn Cleric (9)
"Ive heard it both ways."
Soar CON save: 17
Nub CON save: 5
Nub also casts absorb elements
With their resistances they both take 25.
Nate CON: 7
Nate takes the cold blast, clearly underestimating the power of the cold that this dragon wields. (-25)
Shaken from the cold blast, you all four nevertheless remain on your feet.

With that, the dragon uses the remainder of its movement to slam into the ice walls that make up the side of the cavern, and it burrows into them. It's not clear how far it's gone, but you cannot see it from where you are.
(On the map, I've marked the start of the hole where the dragon disappeared, as a green line. It's forty feet up in the air from the ground, and perhaps thirty feet above Soar and Jalt who are standing on the treasure mound.)
Soar and Nub are up.
Nub points up at the hole with his own finger, not the staff, squinting. "Let's see if this works..." and he casts fireball for 31 fire damage. The point he's going for is 20 feet inside the tunnel, straight in, hoping to account for any turns or twists the dragon may have taken in the 20' radius.
-----
Soar CON check: 19 to hopefully gain 3 temp hp back at the top of her turn if heroism is still active (if it's not, and she sees the dragon, she'll use her bonus action to cast hex with her warlock slot, giving the dragon disadvantage on STR saving throws, though I suspect this won't work with a held action and when Soar might see the dragon)
Soar steps forward and races to the top of the pile, right under the new burrow hole. She looks back at Blagothkus and, after a quick glance at the floating Jalt says, "can I get a lift too? I'm not bashful, grab me and toss me up there if you can! We can do this!"
She is walking stiffly, after getting thrown across the ground and then frozen by the cold blast, and looks briefly at Nate, wondering if he'll join the fight, or if his PTSD has kicked in. "You are stronger than your fears, bigger than your trauma, my friend," she says to herself. "This is your chance!"
Since she's not sure where the dragon went, she channels some eldritch blast energy down her blade, ready to shoot straight at the dragon if she sees any part of it this turn.
Beam 1 Attack: 12 Damage: 1
Beam 2 Attack: 24 Damage: 9
Soar succeed at her CON check, and Nub's fireball flies into the new tunnel mouth and detonates, though it's not clear if the dragon was caught or not.
Blagothkus looks at the tunnel mouth and nods in response to Soar's words.
Jalt and Nate are up.
Nate catches Soar's glance and then also walking quite stiffly after that cold blast he scurries up towards Soar, directly to her southwest. "Did you SEE that?! Where did it go? I'm not sure I can take another blast like that..." Nate kind of looks defeated in this split moment, looking around at the cavern and the giants and all of the treasure and the hole that the dragon smashed in the wall and tries to muster up some confidence. He'll grab on to Soar's wrist and says "Let me help."
Cure wounds L3 on Soar: 24
He looks over at Jalt "Jalt you too"
Healing word L2 on Jalt: 9
Just the one spell per turn, I'm afraid. I'll assume you want to keep that nice roll for Soar?
Jalt will cast Beacon of Hope on him and his friends. He then will use his new found skill and fly up to just outside the hole in the wall and hold there as he tries to get a good look at the hole.
Hoard of the Dragon Queen - Jalt Rhogar - Dragonborn Cleric (9)
"Ive heard it both ways."
I always forget that! Cantrip cantrip cantrip
Yep, keep the Soar heal. Sorry Steve
Jalt, you see down the hole to the furious and seemingly cornered form of Glazhael, who glares back at you from about twenty feet away.
Hulda and Wiglof move into the treasure chamber, but there's no much they can do as the dragon is out of sight.
Round Four:
Blagothkus
Glazhael the White Dragon
Soar and Nub
Jalt and Nate
Wiglof and Hulda
18
Blagothkus, as requested, picks Soar up and places her into the tunnel. Soar can now see the dragon, and her two Eldritch Blast shots fire, one hitting and one missing. That's the cloud giant's full turn, though.