Debuff

Lower character base stats

• eg. decrease str, dex, con, int, wis, cha

Reduce the effectiveness of character skills

• eg. gain disadvantage on attack rolls
• eg. penalty to skill checks or saving throws

Make a character more vulnerable to certain damage or effects

• eg. take 5 extra damage from fire attacks
• eg. acid damage is doubled

Place negative conditions on characters

• eg. make them blind
• eg. make them laugh uncontrollably