That sounds interesting, is there a book like that? Sandstorm and Frostwalk in 3.5 come to mind but they also had player options and other stuff, right?
What is your prefered type of monster book? Standard Monster Manual, where you get seemingly random assortment if creatures of all types? Collection of monsters of speciffic type? Or threats you can encounter in speciffic setting, be it whole world or location? Some mix of the two?
Also, which...
Treacherous swamp. During last war, many times a tank or another vehicle tried to coss it to outmanover or escape an enemy, they all would sink. Now people go there looking for scrap and war-telated thropies and artifacts to sell.
How would the history work, that is a biggest question for me. Nentir Vale had entire empires of Tieflings and Dragonborn, would they now be retconned into Realms' history?
The class taking level in got you that cantrip. You need to pick True Strike when you take a level in Warlock for Agonizing and Repelling Blast, but you need to pick it when taking level in Sorcerer for Innate Spellcasting.
I actually double checked something and
IT WOULDN'T WORK
Repelling Blast and Agonizing Blast specify that they apply to WARLOCK cantrips, while Innate Sorcery only works with SORCERER spells.
I love getting two so conflciting messages - it's either full of cheese or not much better than a Fighter with Heavy Crossbow. At least we agree it owuld work, i guess.
So hypotethically speaking
Rogue 1/Sorcerer 1/Celestial Pact Warlock 6 with Crossbow Weapon Mastery, True Strike, Repelling Blast and Agonizing Blast can:
Shoot someone with true strike, dealing them d6 + CHA from True Strike +CHA from Agonizing Blast + CHA from Radiant Soul
AND push them 10...
I by general rule ignore his twitter posts because it has been very much a meme he's been often blatantly wrong, like ruling Paladin cannot divine smite with unarmed strike because unarmed strike is not a weapon attack, even when it is classified as a melee weapon attack.
The enemies can just...
Isn't it also open from the bottom? Any enemy with burrowing speed can bypass it.
Also, by the time PCs exit, there should be an ambush waiting for them.