1) Use an image editor to make character-sheet animations of the lava, lay down events where you want it to go, and have the switch activate a page on those events with the lava animation.
2) Make multiple maps. You could either make one additional map and copy the relevant portions back and forth using Shaz's Tile Changer, or make an extra map for every possible combination of lava tiles and transfer the player between them.
Hey RPG Makers! Today I introduce to you the Tyruswoo Team's Tile Control plugin for RPG Maker MV! This plugin allows you to select specific tiles on a specific map, and change them into any other tile. DownloadTyruswoo_TileControl.js - v1.00For RPG Maker MV DownloadTyruswoo_TileControl.js -...
I'm in the process of converting all locks and intimidate/persuade dialogue options into D20 DC based success/fail (modified by player skill). Before, it required a certain flat amount you had to meet, but with rolls, it offers more freedom. For instance, you can repeatedly try to unlock a door instead of just not meeting the requirement to unlock it.
Since we get very close: If you want to enjoy the advent calendar as it is intended, wait til your date and the day in the URL line up, so you have the final day on actual christmas and not the day before... time zones ;3