Instead of randomly grabbing blocks of every type, they only take an interest to obsidian and torches.
They attempt to build and activate Nether Portals with the obsidian. This will result in you finding half-completed monoliths should they not be able to readily obtain enough to complete it.
They can optionally convert lava source blocks to obsidian in order to carry out this task.
They have a large detection radius for torches, and will go about attempting to snuff them out. This is where they really become a threat, as they will disorientate you as you wander into caverns unless you protect your torches or use alternate light sources such as jack o'lanterns or glowstone. If seperated from a light source by an impassable wall, they will teleport into the nearest dark area to attempt to reach it. If they cannot, they will eventually lose interest and teleport away.
Instead of randomly grabbing blocks of every type, they only take an interest to obsidian and torches.
They attempt to build and activate Nether Portals with the obsidian. This will result in you finding half-completed monoliths should they not be able to readily obtain enough to complete it.
They can optionally convert lava source blocks to obsidian in order to carry out this task.
They have a large detection radius for torches, and will go about attempting to snuff them out. This is where they really become a threat, as they will disorientate you as you wander into caverns unless you protect your torches or use alternate light sources such as jack o'lanterns or glowstone. If seperated from a light source by an impassable wall, they will teleport into the nearest dark area to attempt to reach it. If they cannot, they will eventually lose interest and teleport away.
No. Endermen aren't going to be changed this radically anytime soon. They move blocks and try to kill you when you look at them, and that's that.