I need campaign ideas for a campaign I’m running, my players have done nearly everything I’ve planned for! FYI the campaign is called The Grimbok Caves. My players are about to face my villain, The Necromancer King’s Army. I have a Tarrasque encounter planned for when they hit level twenty. All ideas welcome, stories of your campaigns encouraged. (I’d like to hear the stories so i have a context in which the ideas can be used.) Thanks!

How long has the campaign been going?

What is the premise of your campaign?

What level is your group?

Do your players have detailed character history?  Often you can find things in character histories that allow you to tailor content  to individual characters.

Have you spoken to your players and asked what kind of content they would like to see in the game?  Asking for DM's only to read this  and comment is shortsighted  Some of my best material comes from collaborating with my players

I need more than a campaign name, a necromancer king, and a tarrasque  to work with.

I like to play around with preconceptions.  My current campaign has a market place in The Abyss being the single best place to shop.  No Taxes, good prices, high level gear.

I would suggest you pick one race traditionally good and make every single member the players meet be horribly vile.   And then go and pick one race tradionally evil and make every single member the players meet be sophisticated and pleasant.  Well dressed, educated, etc. etc.

Do Not Warn The Players.

Let them figure it out for themselves.  Amazing how long it takes them to say "You know, goblins are pretty nice guys, but the halflings here abouts are total scum."

This helps a lot thanks

Xeresia, here are the answers to your questions

the campaign has been going of for a few months

the premise is to have an open world, sorta like a LOTR/ LOZ mix. So far, they have done a few quests for the king of one of the main cities, made a bit of money.

the group is around level 10

a few of them, such as our wizards (we have 4)

no, but your players feedback would be wonderful.

DM’s, feel free to consult your party’s for ideas

There are actually multiple premises in game  both of my Groups operate out of the City of Llindar,  the gateway to a paradise known as haven a tropical island  continent in its own demi plane  complete with a sun and moons  set adrift on the astral sea.   Currently  Both groups are in the employ  of a mercenary company one group is exploring an ancient underground complex that predates the creation of the demiplane. The other group  is investigating a series of ritualistic serial murders. the path of both groups will eventually merge for a short time before they will move onto differrent assignments either investigating the ancient city at the heart of the island, investigating the other two inactive portal towers,  Joining the exploratory corps and going through the mage powered gate system to explore other worlds  or they may journey around island   

If they decide to join the exploratory corps  i have a new campaign in mind that which i am already working on the map for 

If they decide to go to the ancient city    I have been working on that map for almost a year and a half along with a story  for it.

If they go to inactive portal towers i am screwed because i don't have maps made for those or even Lore for those written yet 

If they decide to journey around the island  i can make a new map every week  for them along with  NPC's, mini adventures in the area.  

All of this is just stuff that at one point i thought  was a good idea and just started drawing and writing.

Read or watch some scifi/ fantasy, murder mystery, crime procedurals etc...   look at some random generators as prompts for ideas and talk with your players.  Look at older modules  for ideas... Drivethrurpg is your friend 

Probably the wrong place for this, but I am looking for a DM who wants an NPC/PC to help make a campaign more fun. (Heavy on role-playing, but help the party out with stuff) Play by post only, please. Let me know if you're interested.

This is a simple matter, Jerhi.  It seems you need to expand your mega dungeon, The Grimbok Caves, by several levels if your players have completed everything already.  

I would do that if they HADN’T DESTROYED THE ENTIRE MOUNTAIN RANGE they ended up making a ravine… 30 miles deep….

There was also a near encounter with a Few dragons

howsabout, they get elected to represent the material plane at the U.P (united planes) confrence. suddenly it becomes a RP intrigue campaign, set on MECHANUS. extraplanar NPCs are great (especally archfey) and i love the idea of Strahd just tellecomutiong through a magic mirror because he cant leave barovia