This isn't really a forum game but it is for the planning of one so i figured this is the best place for the topic. It is planning the successor to Treasure sounds a lot like treachery located here:
http://www.bay12games.com/forum/index.php?topic=29990.0.
Game stylePVP capture the flag:Very similar to the last style of game except teams are fixed. Each team could have a special weapon or special abilities. Additionally to increase the treachery factor I could do as inaluct suggested and add a mercenary group.
A-Team:All adventurers will have to work together to make it through the dungeon I set up to reach the artifact and escape with it alive. It will be pretty similar to the last game minus the treachery. Players will be fighting against multiple weaker monsters that I control and move around at the end of the turn. To increase chances of survival, I will include a leveling system so that as you fight you become stronger. Guarding the artifact will be a boss, so those earlier level ups will help.
Original style:Very similar to the last game except with added features like new classes, weapons and map features.
One versus all:One player will get to be a marauding demon (or megabeast of their choice) with the aim of killing all adventurers. The adventurer's goal is obviously to kill the demon. Team work will be critical and so will the utilization of special abilities. After the demon player is dead, he/she will drop an artifact. From there the game will continue on like a normal TSLLT.
RTD/TSLLT:I don't know how I am going to do this, will need some suggestions but I do like the idea of it.
New weaponsPikeAs inaluct suggested, the pike will let you attack players two squares away from you. 1d8 -1 move penalty seams about right.
WhipThe whip can not kill enemies it is more of a paralyzing pain attack. Thus it is only really useful when used in coordination with team members. A 1d8 + 3 to attacking rolls sounds about right seeing as a win will not actually kill the enemy player. A whip can however kill a paralyzed enemy.
DaggerFor the deceiving rogue of a player. This weapon is the backstabbers best choice. With only a 1d4 roll it is weak but it also gives you a +2 movement bonus as well as an attack from back bonus of +3 (on top of the enemies -3).
New classesWhen choosing his weapon, the player may also choose a class.
MechanicHas three mechanisms at his disposal to set up three separate traps. Traps can be set of by anyone walking over them and will be visible to all. If a non allied player walks through a mechanic's trap, I will flip a coin. Heads the trap is triggered and does damage, tails the trap jams. Any mechanic also has the ability to remove a trap.
RogueIs not affected by traps and can also walk through an enemy player's square even if they are defending a tight corridor. Needs further abilities but I can't really think of any.
WarriorPlus one modifier to all melee rolls.
MageHas a special long ranged immobilization attack much like a crossbow. This attack does not need a unobstructed path and has less of a range penalty. The attack however will not kill enemies, it can only stun them making them vulnerable to attack.
MarksmanIf equipped with a crossbow, can fire two shots (instead of one) in one turn by sacrificing all of his movement.
If equipped with a melee weapon, can throw said weapon by sacrificing all movement.
Other stuffI am thinking about adding other things such as armor, sheilds, dodging and leveling but I feel that this would be too much and over complicate the whole game. Something I do want to add however is the weapon stand, where players can swap their weapons to something they find more useful given the situation.
I am also wondering about how I am going to work the the lives system. Should I have it like it previously was where each player has a life the is decided upon in a single battle then sent back to the start or have it where players can gradually lose their health. The health thing would be nicer but I don't think it would work very well when player move about.
Anyway, feel free to add your own suggestions and vote in the poll even if you don't intend on playing.