Twist Wood would have no effect since they lack physical weapons (wooden or otherwise), bout "Disappear" could allow an Elf to be undetected by them.

Two Specters, plus two Elven Warriors, an Elven Archer, and a Dread Warrior wait on the other side of the door.In my initial playtest with the Specter, I concluded that they didn’t seem like as much of a threat as we initially thought. Hopefully AH has done a good job trying to fill all the posible gaps with them (you have already pointed a little flaw, the one about the Mercs equipment and their stealth ability… they seem to be able to wield a Halberdier and be hidden, but a Hero may not that’s a kind of non desired flaw imho). I see this as delving through the corridors of a dungeon and more like sneaking through the narrow streets of an Elven city.

As you explore dangerous dungeons, negotiate perilous woodlands, and deal with formidable foes, you’ll learn the secrets of the Dread Moon. This creates the question, are we still going to get “Equipment” cards for the potions included in this expansion?If this is your first time hearing about Rise of the Dread Moon, this is an expansion for the HeroQuest Game System and requires the game system to play. Unleash the might of the Dread Moon and face its formidable minions in epic battles that will push you to your limits. If we can go into quest spoilers here, you find a Battle Axe and Crossbow, which most parties would already have at this point had they been experienced veterans who have conquered at least the Game System. Your heroes and the ominous creatures that lurk in the shadows are depicted in the intricate miniatures.