This keyword was introduced in the Call of the Crystals set.
A negative effect is an ongoing state that continuously causes harm or some impairment to the target.
It can have a limited duration, last until a condition is met, or last indefinitely.

A disabled and frozen ally	A poisoned and ablaze ally

• Negative effects can be tied to a source (e.g. an enemy attachment) or be active independent of their source (e.g., being poisoned by an attack).
  • To remove a negative effect tied to a source, you must remove the source.
  • To remove negative effects that exist independently, you will require a card or activate an ability that removes the negative effect itself.
• Negative effects can stack on one target.
  
  

• The negative effects currently found in Shadow Era are:
  
  1. Ablaze: At the start of your turn, the affected ally or hero is dealt 1 fire damage.
  2. Poisoned: At the start of your turn, the affected ally or hero is dealt 1 poison damage.
  3. Disabled: A disabled ally or hero can’t attack, defend, or use any activated abilities.
  4. Frozen: A frozen ally or hero can’t attack, defend, or use any activated abilities.
  5. Can’t Attack: The affected ally can’t attack.
  6. Can’t Defend: The affected ally or hero can’t defend.
  7. Can't activate abilities": The affected ally or hero can’t activate its ability
     
     

• NOTE: Are not considered a negative effect:
  
  1. Stat reductions ;
     • Such as reduced attack (Hunter's Gambit, Enslave the Beast)
  2. exhausted ;