Endermen should drop Obsidian blocks! There are several reasons why this could be reasonable:
* They are black, meaning they could be *made* of obsidian.
* They sometimes emit purple portal particles, and portals are made of obsidian.
* They sometimes emit smoke particles similar to the bottom of the map. This is from lava, and obsidian comes from lava.
* Obsidian has been demonstrated to have magical properties, as do the Endermen.
Since Obsidian is such a good building material, this would have to be balanced. Options include:
* Increasing the health of Endermen, since they are made of such a hard material. Possibly extra damage if hit with a pickaxe. This would make them more dangerous, but combat with them is avoidable.
* Invulnerability to Lava and Fire, since they are born of lava. Sunlight would, instead of setting them on fire, instantly vaporize them with no drops.
In addition, they could be available in quantity in the Nether, where it is also more dangerous because there is no water.
* They are black, meaning they could be *made* of obsidian.
* They sometimes emit purple portal particles, and portals are made of obsidian.
* They sometimes emit smoke particles similar to the bottom of the map. This is from lava, and obsidian comes from lava.
* Obsidian has been demonstrated to have magical properties, as do the Endermen.
Since Obsidian is such a good building material, this would have to be balanced. Options include:
* Increasing the health of Endermen, since they are made of such a hard material. Possibly extra damage if hit with a pickaxe. This would make them more dangerous, but combat with them is avoidable.
* Invulnerability to Lava and Fire, since they are born of lava. Sunlight would, instead of setting them on fire, instantly vaporize them with no drops.
In addition, they could be available in quantity in the Nether, where it is also more dangerous because there is no water.