Asheron, the tentacle demon isn't a chasm creature. Therefore you now own a non-existant tentacle demon.
Since Exodus was used, I invoke the United Nations Ruleset. It has the effect of putting any exodus'ed civilization under miles of red tape. The effect is that research crawls down to a halt and you develop a deficit in budget.
Furthermore, your emergent civ is too large to fit the normal space inside the ex-reversal portal, therefore even if you research is completed, you would only get 74 ka's (kobold ambushers), 92 gim's (which is misspelled so it's either gym or gin) and votolom tailcocks (whatever that is).
Dwarfaholic, as reversal is in effect, your hammerer and goblins get the power of drop (instead of flight). They are now unable to jump. Elimination of the chasm only creates more chasm tiles and nobody falls into everythingness.
Since my lawyer is still alive, I order a ekirtsremmak on all non-nobles (which causes all nobles to be hammerstruck on reversed terrain and all non-nobles in the normal terrain).
Now since everything is in such a mess as no-one really understands what's going on in this game, I invoke the rule of General Mayhem (ADOM Ruleset) which grants me a multiple-headed elder chaos wyrm and alienates all ADOM-haters. The chaos wyrm is non-reversible, he is also sleeping.