If you didn't realize, there are some mobs you can't put on leashes (such as villagers, wild wolves and ocelots, "monster" mobs, and bats, to name a few). I mean, I know, you can use a fishing pole instead, but that's not quite like a leash. You can't hold other stuff while leading this mob, the mob doesn't really follow you, and you can't tie it to a fence.
I would suggest that a leash should work on all mobs (outside of boss mobs or players of course), but it seems a little weird to put a mob like that on a normal leash.. So how about a chain instead?
Appearance: This appears just like a leash, but it's a little thicker and is a grey-silver with a chain-link instead of a "leash". The collar also appears to be made of metal like the rest of it.
Usage: It's used just like a leash, but any mob can be on it (this excludes the Ender Dragon, the Wither, and other players, however). Like a normal leash, it can be attached to fence posts or held by the player. Essentially, it's just like a leash.
It could be useful at relocating villagers, althrough I don't see why someone would want to use it on hostile mobs, as their only usage tends to involve killing them, apart from Johnny Vindicators as killing method in mob grinders. In order to give it more uses, Chains should be able to link entities together, which could be very useful when applied to Minecarts or livestock (Mostly for breeding purposes, such as chaining 2 animals together so they're always close, which could be useful in cramped pens).
On the flip side, the recipe includes an Iron Nugget, which is an item that needs more uses. However, the recipe should use 5 iron nuggets and 1 ingot instead.
I get offtopic a lot, be warned. I also often mention a Minecraft clone called Minetest. The clone is nowhere near playable with it's default game in my opinion, but it's at least the start of a good open-source voxel rendering engine, and maybe one day it might be decently playable.
Something about the idea of carrying a villager on a chain sounds really disturbing in a game like Minecraft... But I do like the idea of being able to leash mobs like Zombies, Skeletons, etc.
Think that chaining villagers is hardly the worst that can be done to them, and that doing so would be mostly useful at relocating them, which would only be really disturbing if it's in order to make an Iron Golem farm.
You know i can only support soo many things and the level of benevolence this has already wanting me to support 100% due to greedy villagers deserve to...
Anyway, I would love this but can i make suggestion that the chain allows linking between entities and fence posts and players can walk on top of the chain when linked between two or more entities and like others have said to do linking of minecarts and boats... Also better crafting recipe
Null ~ Iron Ingot ~ Null
Iron Ingot ~ lead ~ Iron Ingot
Null ~ Iron Axe ~ Null
Giving the lead a new use
That recipe makes no sense, as, apart from the completely random iron axe in the recipe, chains aren't made from ropes.
No but in minecraft it's the only way it could be made unless the crafting table is an anvil and you have an hammer which doesn't make any sense at all.
We don't have a smelter, we can't cook iron in the the furnace except armor to get nuggets. How is steve going to make the chain? He has to do something right? apply slime all over iron ingots? See Realism is a fictional aspect in minecraft and shouldn't really be a necessity now. I know you want it to make sense but right now all the crafting bench really does is throw the items in and forms a new item.
Also your recipe is cheap. It needs work.
60% support now.
The crafting table can be used to make tools, so it seems to be used as an anvil. Chains still aren't made from ropes, and you can already make clocks at the crafting table, and those involve TINY pieces. Finally, the Crafting Table usually tries to make the recipe at least vaguely resemble the output, and doesn't rely on nonsensical items being put in them. Plus, your recipe would only make it even more complicated, as simply shaping some iron in interlocked pieces is a lot esier to understand than making chains by somehow using a rope lead and an axe.
You CAN smelt iron. That is how you get it unless you make an Iron Golem farm: Smelting ore. Plus, tools can also be smelted down into nuggets. (In fact, the original recipe uses them, further making it superior as it gives a nearly pointless item an use).
Finally, your crafting recipe tries to slightly inflate the cost of an item that is more useful in large amounts, makes no sense (Why is there an axe in the recipe?), and doesn't provide new uses to underused items.
Finally, why do you even bring up the (disproven) argument that the crafting table isn't an anvil, so the recipe used in the OP wouldn't be realistic, in order to defend an unrealistic and unintuitive recipe?
Lets agree to disagree and move on. I was only trying to say it just because it doesn't make sense doesn't make it a valid reason to disapprove of something, especially when they are trying to help in anyway they can I offered a different crafting recipe that's more spendy as right now it's relatively cheap and I don't see it needing that cheap. I want it to cost more. That is all. I have my reasons why I would and I bet you have counter arguments for them but I don't want to continue it, so again lets agree to disagree and move on.
Why would Chains have to be that expensive? Plus, your recipe only slightly increased the cost to 6 iron balls, 4 String, and 1 Slimeball (And the latter two are easy to obtain if there's a nearby swamp, so iron is the more limiting factor), so all it did was make a weird recipe without doing much balance.