Keep Highest (kh) - Keep only the highest N dice
• 4d6kh3 - Roll 4d6, keep highest 3 (classic D&D stats)
• 2d20kh1 - Roll with advantage (same as "adv")
Keep Lowest (kl) - Keep only the lowest N dice
• 2d20kl1 - Roll with disadvantage (same as "dis")
• 3d6kl2 - Roll 3d6, keep lowest 2
Drop Highest (dh) - Remove the highest N dice
• 4d6dh1 - Roll 4d6, drop highest 1
Drop Lowest (dl) - Remove the lowest N dice
• 4d6dl1 - Roll 4d6, drop lowest 1 (another way to roll stats)