So is Water/Nature the middle ground between fire and shock (with low speed reduction but reliable-ish damage) or the middle ground between shock and stun (with powerful speed reduction but little damage dealt)?

Since you apparently want 'Nature' so much, I'll try and think of something.
First goal - shock is annoying, but can be negated by using your shield. At least the damage. So - this one shouldn't be annoying, as in shock.

I just got an idea. How about players not being able to switch weapons and use their shield? No speed decrease. The vines could stay. The player can still turn. This effect might last a bit longer than the others, but a player can break free with a few attacks?
And- sorry to say this- Nature just doesn't sound like the name of a status effect. What would make a lot more sense would be something like ''Trap''.
Currently trying to find middle grounds between Nature and Trap.

But- that was me just trying to add on to the idea pile. A stun/fire combination would be great.

MFW apparently I'm not constructive to suggestions.

I'm with Holy-Nightmare on this one though. Seems as if this status doesn't add anything new to the table. The apocrean grabby-hands are a reskin of freeze just without the status resistance available, however that's bound to an event.

Names such as "Nature" or "Water" do not sound like a status affect. I understand where you're coming from in terms of wording, because the wording in-game sounds similar (Fire, Poison, Shock), however the names you give are similar in feel to renaming shock "Lightning". However, as of right now, a name is not very important.

Holding an enemy in place is currently used by two statuses, sleep and freeze. Messing with movement is currently used by two statues, shock and stun. Damaging the player over time is currently used by two statuses, fire and shock. Therefore, adding a third status for all categories jumbled together is not the best of statuses. If you wanted to, you could instead make this closer to curse, in that a single item in your inventory is "barbed", and hurts you if you use it. The difference between this one and curse would be that the barb would cycle through your items, so your weapon in slot 1 may be "barbed", and 5 seconds later your weapon in slot 2 will be barbed. This carries over into your item belt too, so you can have both weapons not barbed, but it may cycle back into them.

The icon for this status would be a brown triangle pointing down with smaller pointed triangles coming off of it (3 max, on the sides), and a green background. When your current weapon is barbed, you will get that icon over your head, and when it switches to another weapon, the icon will become mostly transparent, becoming fully opaque again once it cycles back to that weapon, or disappearing with a poof when the status wears off.

Now that I've gotten to the end of my reimagining the status, I would give it the name "Prickle", "Thorn", or "Barbed". This is still a nature theme without being a new status in a flood of similar statuses, and sounding more dangerous.

I'm not sure spiral knights has seas for water to make sense but it could incapacitate things from being able to attack.

I came up with the barbed idea because both "nature" and "water" statuses just seem dull, repetitive, and necessary. At the very least "barbed" wouldn't be a reskin of other statuses that we have enough of (mettling with movement, damage over time), but not add any game-breaking difficulty to a status.

So in other words, I dislike both "nature" and "water" simply because their roles are already fulfilled. I prefer neither.