Yair said:
Mine is "will DM".
I used to have a "Killer DM" rep with my old group. A few TPKs will do that for you. This doesn't apply to my current group, though. Yet.
In the old days, we had something called a "Jake Kill" (my nickname is Jake, among others... although most call me Hound now). A Jake Kill involves a character death with no die rolling.
Jake: "Bill, you start feeling hot"
Bill: "I look around"
Jake: "Really hot, feverish"
Bill: "Uh oh, guys?"
Jake - to everyone else in the party "You see a flash back on the island where Bill was, what do you do"
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Jake: "You see a strange glob at the end of the stick"
Glenn: "I touch it"
Jake: "You die... err... I mean, Glenn starts screaming and gurgling and collapses to the ground - what do you do?"
Bill: "I pull out my gun and put him out of his misery"
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Then it became a rep for letting players see death just before it got them, especially in CyberPunk. Nine times out of ten, a surprise attack that hit the team would be noticed by one or two people, but inevitably, they rolled low for initiative, and the ambush, HONESTLY BY CHANCE, was aimed at those characters - so they were the only ones aware of the attack, and it killed them before they had a chance to react.
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I had a reputation for visceral gore, and great descriptions thereof, but this has died off because I game with my kids now. I really enjoy describing weapons cutting through viscera and tendons, shuddering to a stop against bones, blood spray from bullet wounds, and so on... but this still exists in my other combat descriptions - flying spall as autofire weapons blast away at subway station walls, sending chunks of tile and concrete flying about - as well as descriptions of acrobatics, tumbling and good use of balance in combat as they hop up on banisters, fight across tables and so on.
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Now... Now my rep is big scary monsters. In the middle of a game, if I pull out a sheet that is obviously from the printer when an encounter begins, the players have learned that it REALLY might be a good idea to not push the battle, and to run if it starts going bad. Things like ebon servitor mariliths, true mummy two-headed cairn dragons, custom psionic liches, a cerebrelith with lots of ranger class levels (can you say "predator"?) and so on...