The party fought a long battle with Morgan of J'Lynh who saw no issue employing traumatic tactics like wall of force or summoning the pained Hound of Arepo, Buddy. The reinforcements, meanwhile, fought off a horde of aarakocra bandits to the south, sending the occasional inspiring message to the fighting party. After much fighting, the Somnian leaped out of Devinn's body and slowly started making its way towards Morgan, increasing in size and absorbing all nearby light as it went. The party did its best to restrain Morgan as he made efforts to keep his distance. An exhausted Arkorow made all the effort to taunt Morgan meanwhile employing some alternative tactics.
While they were almost all very wounded, they eventually pinned him down long enough for the Somnian to grab hold, and with a final look to Devinn, "Friends?" it enveloped him and took both Morgan and itself out, as was its purpose, and only a few scattered items were left behind where Morgan once stood.
Just then, Arepo seemed nowhere to be found. In the distance, from no direction, in particular, a majestic dragon's roar was heard, as the mansion began to tremor, and a large tree sprouted through its center, upwards, then curving towards an oncoming horde of up to two hundred aarakocra. Its branches pierced each of them, killing them instantly.
Its trunk appeared hollow; within, the party found Buddy, clawing its way up and carrying an unconscious Arepo.