Ghost Dragon Guardian

Ghost Dragon Guardian is a side quest that can only be accessed by exploring the Underground River area in Chapter 10 of Baldur's Gate: Siege of Dragonspear.
== Acquiring ==
In the far southwest of the Underground River, Gorion's Ward will encounter a ghost dragon named Halatathlaer outside of the entrance to the ruins of Kanaglym. She will warn them not to approach her, saying that she is compelled to guard the entrance. No matter what the player says to her, she keeps returning to this basic point.
== Completing ==
If the player chooses to attack Halatathlaer, she is worth 10,500 EXP and the gateway to Kanaglym is open. She is, however, a difficult battle.
If the player simply ignores her and walks past her, she will thank them; the necromancer who bound her made a mistake in their commands, compelling her to threaten potential intruders, but not to actually attack them. She warns that the necromancer resides within the ruins, and as long as they hold her essence, she can be compelled to attack the player. If they proceed into Kanaglym, they will be attacked by the resident necromancers; if Kherriun is sufficiently damaged, she will drop the talisman that allows her to control the ghost dragon and Halatathlaer will begin attacking the enemy creatures within Kanaglym - otherwise, she will attack the player's party until either released or slain. Once the Cabal is dead, she will thank the player for freeing them and, after instructing them to seek out Daeros Dragonspear and tell him that she waits for him in the Fugue Plane, will pass on to the afterlife, rewarding the party with 32,000 EXP.
Regardless of which outcome occurs, entering Kanaglym is necessary to begin and complete the quest The Cabal.
==Halatathlaer's Hatchlings==
Halatathlaer's children are the Blind Albino Wyrmlings in the Underground Wyrm Cavern area. If she is approached whilst the party has the Journal of Ithtaerus in their inventory, she will give unique dialogue depending on when this happens.
If it is done before slaying the cabal, she will directly tell the party that she will aid them if they free her from Kherriun's control, assuming they do not mock her for the death of her children