MonsterEnvy
Legend
Even if Counterspell doesn't work, which I concede I misread as an innate spell like ability, not much changes. If the creature wants to attack the party, it has to be within 120 feet to use it's spell like abilities which puts it comfortably within range of the ranger and/or a hastey barbarian.
I should point out the Illusionist Wizard spent all his ability increases on Int and has the only very rare item in the party, an Ioun Stone of Intelligence stolen from a deceased wizard they fought. The illusionist is actually smarter than this fiend.
Yeah so your wizard gets one reaction a round. If he counters the first spell Moloch casts he can't counter any others. And if a stinking cloud is dropped on the Wizard he is likely not going to do anything for that turn.
I tested Moloch against my level 12 party of 6. And he kicked their asses. They only got one really good blow in the entire fight. When I forgot to have Moloch teleport out of the Paladins Melee range and the Pally with his vorpal sword critted him. (Moloch being legendary is immune to the instant kill, but the sword does a bunch of extra damage if they are immune.) Still he was able to easily leave the fight and regenerate. And the Pally and Barbarian were the only party members that could even fight him. As the Cleric, Rogue, Ranger and Wizard got blasted by his despair breath soon after he teleported behind them after the Pally and Barb charged him. (And none of them made their save.)