Actually the amount of force a ship uses to go forward would be held by the 8000 lb limit, it could not hold that ship above water, but in the water it could hold it in place.

So fun

Oh, I wouldn't touch that. It's a load bearing rod. 

you can also kill people by cutting them in half with it

In regards to spells that push objects away like Thunderwave (Druid lvl 1 or higher spell) could it move the Immovable Rod?? Cause the Rod says its fixed not secured.  

It's more likely to tear a hole in a ship as the material the ship is made from probably can't sustain the limit despite the fact that the ship as a whole probably could.

I feel like the ship would need to be specifically designed around it, the same way an anchor is attached to the ship. Just have the rod on a chain, hit the button and you're anchored.

The Players Handbook says that:

"The hand can't attack, activate magic items, or carry more than 10 pounds."

It'd work if you had a druid make a pocket in the wood of the keel (backbone of the ship)  place the rod in and activate, then seal it up. 

The keel is not going to snap in the forces the ocean would put in it. But tide rising could sink it, or lowering could cause damage as it's fully held out of the water by the keel. 

if you fight a big creature have a barbarian of someone go in its stomach and make it immovable then have everyone run and it might follow ripping its chest open  

Boss fight: Takes out immovable rods and activates and them. Any player within ten feet of the boss can be struck for critical damage.

Quote from ReaverBroodCleaver >>

hey if u stick one off these rods into a open wound of a creature that regen would it heal around it or push the item out(serious question no jokes please i've thought of ten just by writing this)

 I mean it says it’s an immovable force so unless the healing skin has a weight of 8000 pounds I think it would just heal around it

but the creature could probably just click the button and let it out unless it was in an unreachable location

Quote from Bethnal >>

@DnDNewper

Interesting idea but it takes a full action to push the button so unless you can figure out a way to do it as a bonus  action youre going to fall 500 ft by the time you can push the button the 2nd time. Might be able to stop yourself before you hit the ground but I'd rule that as requiring a successful strength check to hold on when the rod stops suddenly.

 And even if you succeeded you have the whiplash to worry about

Actual I did the math and most giant can only like around 6000 lbs so they can't necessarily move it but could probably strength check it but that takes time. 

In 6 seconds of freefall you will be going about 100 miles per hour. Now you try to *instantly* stop. That rod would slice you in half.

Okey, so it's immoveable, but in which inertia system? 
Because let's say you are trying your cheezy maybe not too original strategy and put this down into the gullet of an ancient dragon.
Then the dragon flies away.
I would say the rod moves away with the dragon without actually moving. Well in a way it's always moving as long as Toril is a planet. But you put it in the stomach of a dragon where is stay, but the dragon itself is moving away.

As DM I'd allow Mage Hand to push the button.

My guess is the wording on Mage Hand not being able to activate magic items is intended to prevent people from using magic item charges, such as an Arcane Trickster using a Bonus Action to fire off a Wand of Magic Missiles or something. Pushing a button is different. RAW - it says "you or another creature" so even Unseen Servant cannot activate or deactivate the rod.

If Immovable Rod had charges you expended, I'd agree, but since it's simply a button, I'd totally allow anything that can hit the button to do it. Even throwing a rock into it, or poking it with a stick.

Use it to sink a ship? Knock a hole in the ship and stick the rod in. Tie a rope to it so even if it deactivates you can pull it back and do it again.

For falling a Fighter with multiple attacks could activate it multiple times a round along with bonus actions. Add a rope and a lot more options open up.

I built a rope and shield platform and with boots of striding and jumping set the rod at 30 feet. Then move cleric or mage out of melee combat range by hoisting them up. Don't always have time for this but has come in handy a time or two. 

Works well in combination with a large shield as a quick wall for ranged protection or slowing down an enemy charge. Great in dungeons. 

I have been lucky enough to pick up 2 in my adventures which really opens up creative possibilities for great role playing and creative solutions outside of hack and slash solutions. Use a modified arrow quiver for quick access and storage. 

There's a reason I chose Battle Master over Barbarian 😁

Quote from Program_Continuum >>

8,000 pounds of daggers

Which means 6526 daggers, with just under 0.625 pound to spare

 Actually, according to the PHB, 8000 daggers.

Quote from Barjack521 >>

Immovable rod + sovereign glue= best prank to pull in a sleeping enemy. Glue takes one minute to set. Have the roughest sneak up and place it between their shoulder blades with the glue on it. One minute later: Push botton, wake up the sleeping baddy and watch as hilarity ensues.

 What will supposedly happen?