In a Dark Gyffte hardcore run, script just killed the bonerdagon replacement and immediately aborted out with 'Failed to kill bonerdagon'.
Restarting it had it visit the cyrpt to try again, failed but didn't abort, went and checked the council, and seems to be continuing fine now.
 Haert of the Cyrpt
Encounter: The Haert of Darkness
Encounter: Jayden Goldsing
Round 0: Laserrobotics loses initiative!
Round 1: Jayden Goldsing drops 17 attack power.
Round 1: Jayden Goldsing drops 17 defense.
Round 1: Laserrobotics attacks!
Round 2: Jayden Goldsing takes 113 damage.
Round 2: You lose 15 hit points
Round 2: Laserrobotics casts MICROMETEORITE!
Round 3: Jayden Goldsing drops 10 attack power.
Round 3: Jayden Goldsing drops 10 defense.
Round 3: Laserrobotics casts SING ALONG!
Round 4: You lose 14 hit points
Round 4: Laserrobotics casts DARK FEAST!
Round 5: Jayden Goldsing takes 10 damage.
Round 5: You gain 47 hit points
Round 5: Laserrobotics casts CHILL OF THE TOMB!
Round 6: Jayden Goldsing takes 530 damage.
Round 6: Laserrobotics wins the fight!
After Battle: You gain 9 Magicalness
After Battle: You gain 7 hit points
You gain 85 Meat
You gain 11 Meat.
You acquire an item: red money bag
After Battle: You gain 8 Beefiness
After Battle: You gain 26 Mysteriousness
After Battle: You gain 9 Roguishness
Post Adventure done, beep.
Failed to kill bonerdagon