The Spiked Grem is a peaceful mob that only appears near crops. It is considered both a hazard and a gift since it will eat your crops but also drop Bone Spikes upon death. Bone Spikes can be used for traps, mob grinders, etc. Touching the Grem will hurt you and other mobs, but not other Grems.
I just like the idea of non-hostile mob that can hurt you if you touch it. Rather than hostile, it's sorta like "inadvertently hostile" mob. I also like that it's a nuisance and will eat your crops, but not so big on the "bone shards" idea. Maybe just a ton of flint so people don't need to mine gravel for it.
I like the bone shards, but I would prefer a specific system for the eating of vegetation; it chews crops down to level one growth, but no more. That would also make it a slightly more realistic pest; if you have an infestation, you will find your crops to be granting you less than optimal output. Also, it would have to be large enough that you can attack it without damaging nearby crops if you're carful. Or perhaps have an animation where it rears up on its hind legs to have a look around, raising its collision model enough to be hit with a sword.
This thing is awesome and adorable and receives my support despite being a loathed pest of wheat. :V
Rollback Post to RevisionRollBack
"Minecraft? Realistic? Really? This is a game where you punch trees to get wood, you can make the wood into wooden planks in less than five seconds, and trees don't fall even if you remove a piece of the trunk from the middle. This is a game where animate corpses, giant spiders and exploding green terrorists emerge at night to hunt you down, farm animals run rampant across the countryside, and you can stop the flow of molten lava with a block of snow."
Since the spiked Grem is a pest for crops (see OP) I made this to go along with it:
The scarecrow can be crafted to keep the Grem (and other passive mobs!) out of an area around it (10x10x10). Another idea I had was that any crop within a 5x5x5 field around the scarecrow would get a growth boost (1.5x as fast). What do you think?