The huge treant, who's topmost branches scrape the ceiling of the room, moves in to assault the golem just as Yvette is whisked out of the action to be replaced by Alain - buzzing with magic. A few blows of its mighty trunks are enough to pound the golem into oblivion. As the giant slab begins to split into shards, some sort of reaction seems to be happening within the bared core of the creature. Something is ignited and a sudden blast of flame engulfs the room.
The blast seems to rouse Tomlin, and he awakens, charred and drowsy.
Tomlin, Azrien and Alain are still very conscious of the choking air that they are breathing. There seems to be no way out of this room. Azrien and Guardian (with their permanent detect magic) are aware of a moderate magical aura which fills the room - Azrien recognises it as abjurative magic.
Spoiler
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Regardless of Moonwort's dubious mathematics, he hits at least once and does at least enough damage to floor the Golem. In case anyone is uncertain, objects are simply defined as 'non-creatures' so this golem is not an object.
Damage from the explosion (fire):
Yvette 11
Guardian 21
Azrien 21
Moonwort 42 (halved then doubled)
Tomlin 42
Alain 42