You can read the 2 missing chapters on Mangafire.to: https://mangafire.to/read/shinjiteita-nakamatachi-ni-dungeon-ouchi-de-korosarekaketa-ga-gift-mugen-gacha-de-level-9999-no-nakamatachi-wo-te-ni-irete-moto-party-member-to-sekai-ni-fukushuu-zamaa-shimasuu.kkq84/en/chapter-142
That thing is very clearly a extra-giant salamander. See, here's a giant salamander:
That means it's an amphibian, not a lizard like a dragon, so I think Ceres can kill it no problem.
No, the JP author is still making new chapters.
The leader of the previous scanlation team Comfy Pillow Scans had personal issues and couldn't translate it anymore. I think her husband died from a heart attack due to overwork, so she has to take care of her daughter by herself now. I wish them...
Useless f***ing bosses, as always...
Note to any readers in similar situations: NEVER do extra work for employers unless you can get extra money for it. Employers are here to work you to death, so your job is to price gouge in return.
For example, the MC here should not write a manual...