So according to the info, to build one you need to have Master mason (lvl3) to unlock the knowledge, then make a regular cauldron and combine it with advanced siege tools in a blacksmith bench.
The problem is that I’m not seeing the knowledge anywhere.
I have master mason, all the parts unlocked, even the ballista and trebuchet, but no Burning cauldron, just the regular one.
Any info on this? Or is this a bug?