Here’s something fun to do when you get bored.
First, get some Thief friends. You can barely manage it with one friend, two makes this easy, and more thieves just mean more fun. I’d also strongly recommend that you be in voice chat of some sort; it just makes it much easier to work as a team.
Next, have all of the thieves use this build. They should use their best Healing Power gear, and Condition Damage or Toughness are also priorities. The Runes and Sigil are nice, but certainly not required. Additionally, everyone should purchase and use Orrian Truffle and Meat Stew (+40% endurance regen, might on dodge). It’s pretty cheap and will really, really help you.
Now you’re ready to troll zergs. Here’s how it works: skills that do not apply direct damage do not break stealth, even if they apply damaging conditions. This means that you can use Choking Gas or Caltrops and stay in stealth.
Three thieves using this build can work together to keep themselves in stealth 100% of the time. While in stealth, you regenerate health (~350 hps), remove a condition every 3s (which is a lot), and move 33% faster.
Your goal is to cripple and debilitate a group of enemy players. Stay right in the middle of the zerg, and work together to stay in stealth. Spend all of your initiative on Choking Gas. It applies large stacks of poison to the enemy (7.5-9s every second). It also applies weakness (3.5s every second) to any enemies in the poison fields. Focus on spreading the poison fields apart so that as much of the battlefield as possible is covered constantly.
You should also be using Caltrops on cooldown, for AoE cripple and bleeding. You can dodge frequently (once every 5s), and every dodge drops calrops which cripple and bleed nearby enemies.
Additionally, all these things are healing you heavily with Signet of Malice. Without any healing power on your gear, the passive effect will heal for 115. This means that each Choking Gas or Caltrops can heal you for up to 575 per second. Add this to your stealth regen and condition removal and the fact that the enemy cannot see you, and you’ll probably survive for a really long term.
This is a really, really powerful tactic. A group of three or four thieves can maintain permanent Poison, Weakness, and Cripple on a large group of enemy players without dying. If there aren’t any allies nearby, this will make the zerg waste time trying in vain to kill you. If the zerg is fighting people on your server, they’ll have a massive disadvantage. If the numbers are even close to equal, your allies should win the battle handily.
Additionally, this is fun. It’s really, really entertaining to play a thief like this. You’re a ghost on the battlefield; no enemies can see you, and you (and your friends) sow chaos among the enemy. They’re getting crippled and debilitated by enemies they can’t see, and they’ll be obviously frustrated. It’s fun to laugh as they fail to kill you.
Finally, every 90s, you can turn into a whirlwind of death. A Thief using Dagger Storm and Signet of Malice in a group of enemies is nigh immortal. Three to five Thieves using Dagger Storm and Signet of Malice are immortal, and they will also kill literally everything around them. Some enemies will survive by thinking fast and using projectile-blocking or invulnerability abilities, but the rest will all be cut down by your massive AoE damage. Once Dagger Storm ends, you go into stealth, stomp the enemies, and resume sabotage for a minute and a half.
A couple Thieves using this build and strategy can turn the tide of a sixty-man fight. Whether it’s from crippling and debilitating the enemy or laying waste to all around you with Dagger Storm, you’ll have a large effect on the battlefield.