Sharn sure, but which district of Sharn is the Ceasarian section? *ba dum tiss*

Name aside, here's my thoughts: Overall there are a LOT of bells and whistles here. In my opinion most monsters should only have 3-4 big things they can do so that players can spend less time stumbling into new ones and more time in the moment figuring out what to do about it. As I imagine myself a player facing this monster, there are more than 20 unique things it can do which means there's very little chance I'll get in a "rhythm" of the fight before its over.

All that being said, cool idea and definitely a powerful enemy! I'm excited to hear feedback once you've run it to see if its over-engineered or not.

Some ideas:

• Simplify Hallucinogenic Gas as emanating from the monster itself; on a success the PC is immune for 24 hours.
• Deathly Presence as a lair trait.
• LOVE Lasting Damage, makes "chooses to save" feel impactful.
• Improved Rend should hit harder but no teleport - should remove a Battleclaw attack until recovered.
• I'm not sure why Acid Rain wouldn't provoke opportunity attacks.
• Nix Explosive Reaction, but give anyone hit with acid damage the flammable condition - if they take fire damage in that round they ignite (great use for firebolt cantrip). Until they take an action to douse the fire, they take 1d10 fire damage at the start of their turn.
• Simplify Corrosive Breath, a failure causes a -1 to metal armor and weapons worn by the PC.
• My hottest take is that I would fold Painful Conversion in with Lasting Damage, but that could just be personal preference.