Does the damage bonus from lita chandler work against this creature? It seems yes, because lita says: "

...that investigator deals +1 damage."

So it seems the damage is added to that from esoteric formular, not dealt by lita herself, which would be prevented by the creatues ability.

It works fine. Lita isn't providing seperate damage, she is increasing the damage from an attack already happening. 

Of course, it is unlikely (but not impossible) that Lita will be in a deck by the time these guys are met...

Does the damage bonus from lita chandler work against this creature? It seems yes, because lita says: "

How do you still have Lita going into this?

While advising against, it does say you can keep playing with the same experienced decks from the end of one campaign on into the next. And the resolution to the third scenario of Night of the Zealot doesn't tell you to remove her (even if you feed her to Umôrdhoth!)

My group certainly took her Werewolf hunting after the first campaign (although we had not fed her to anything first, that might have strained credulity.)

ah yea, that's awesome.  Guess that is a benefit of carrying through.   Do you plan to continue on into Carcosa with that group?

Well i don't. At the end of the Curse of the Rougarou, our Roland had 4 mental trauma, so continuing didn't seem like a good idea. But who knows what crayne01's plans are...