Steading of the Hill Giant Chief
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Gaze focused on the Bugbears assaulting Korgazhar, Ambrosia whispers "Don't you hear the Keeper's call to join him?"
After that he'll call out to his companions "Our choreography may need some work but you're managing wonderfully, go team!" and each member (including Ligeia) feels a surge of energy and a spring in their step.
Rolls
Dissonant Whispers - (3d6)
(166) = 13
Seeing the half-orc take a pummeling from the bugbears, you step out into view to cast your spell upon them. One of them, the one immediately to the left of Korgazhar suddenly stiffens and grabs his head. Whirling around to see what demon assaulted his mind, he turns to run south, away from the source.
Rolls
Bugbear #7 WIS Save - (1d20+1)
(13) + 1 = 14
Rolls
AOO Attack (with adv, GWM) and Damage - (1d20+6, 1d20+6, 1d10+17)
1d20+6 : (10) + 6 = 16
1d20+6 : (6) + 6 = 12
1d10+17 : (7) + 17 = 24
You can feel a warmth flowing over you, even as your rage lashes out at the cowardly bugbear. Unfortunately, you are still a bit stunned from the onslaught by the bugbears, and though you strike the beast your attack does not pierce its thick armor.

Question: Are any of the bugbears still affected by Hypnotic Pattern?
Question: Using Ambrosia's reaction-based movement, could Julian run up and mount Ligeia before his turn?
Question: How high is the ceiling?
1. Yes, #4 and #5 are indicated as under hypnosis still (this is round 4 since casting)
2. Yes, with your being closer to the front you can easily get mounted given the free 30' of movement
3. The ceiling is roughly 15-18' tall.
Ligeia: Hooves Attack against Bugbear 8, then a shallow flight north avoid the bugbears, then west to give vision on the fire giants. (Using as much of the 90ft movement as is necessary), preferably moving again after hypnotic pattern is cast to be far away from the bugbears if possible.
Julian: Hypnotic Pattern on the fire giants when they come into view, dropping concentration on the bugbears.
Rolls
Hooves - (1d20+6, 1d20+6, 2d6+4)
1d20+6 : (7) + 6 = 13
1d20+6 : (7) + 6 = 13
2d6+4 : (31) + 4 = 8
Leaping upon Ligeia, you command Lenore to aid her while you ready another spell. The bird does its best to flap in the face of the bugbear, but it does not seem to help. The Pegasus rears up slightly and strikes with her hooves, but the lumbering beast is unfazed. As you rush past, the bugbear swings a mighty blow at your steed.
The blow lands solidly on her flank, bringing a screech of pain from her as the metal spikes rip flesh from her haunches. Leaping away, you release your spell upon the two giants. One of them succumbs, the other cones charging your way.
Rolls
Bugbear AOO on Ligeia - (1d20+5)
(10) + 5 = 15
Bugbear damage on Ligeia - (2d8+3)
(84) + 3 = 15
Fire Giant #1 WIS Save - (1d20+2)
(1) + 2 = 3
Fire Giant #2 WIS Save - (1d20+2)
(20) + 2 = 22
Rolls
Insight check - (1d20+2)
(12) + 2 = 14
Rolls
Bugbear Deception Check - (1d20+0)
(6) = 6

Rolls
First attack with advantage. - (1d20+9, 1d20+9)
1d20+9 : (1) + 9 = 10
1d20+9 : (2) + 9 = 11
second Extra Attack with advantage - (1d20+9, 1d20+9)
1d20+9 : (18) + 9 = 27
1d20+9 : (2) + 9 = 11
Damage on second attack. weapon, sneak, fire - (1d8+5, 3d6, 2d6)
1d8+5 : (7) + 5 = 12
3d6 : (321) = 6
2d6 : (26) = 8
Edit: The damage roll for the 1d4 is 2, and GWF lets me reroll 1s and 2s. Lazy, let's say it's 3? (In case that last point matters).
So, 47 damage to #8, if that's not enough to kill it, then another 20. If that's enough, then 22 damage to #9.
Rolls
Glaive Attack & Extra Attack (with adv and GWM) - (1d20+6, 1d20+6, 1d20+6, 1d20+6)
1d20+6 : (8) + 6 = 14
1d20+6 : (12) + 6 = 18
1d20+6 : (11) + 6 = 17
1d20+6 : (9) + 6 = 15
Glaive Damage (attack & extra attack with GWM) - (1d10+17, 1d10+17)
1d10+17 : (8) + 17 = 25
1d10+17 : (5) + 17 = 22
Either GWM Glaive or PAM bonus attack (with adv) - (1d20+6, 1d20+6)
1d20+6 : (16) + 6 = 22
1d20+6 : (18) + 6 = 24
Either Glaive or PAM damage - (1d10+17, 1d4+17, RA)
1d10+17 : (5) + 17 = 22
1d4+17 : (2) + 17 = 19