If terror refers to a feeling of extreme fear:
* Peace: A state of tranquility and calmness.
* Courage: Bravery in the face of danger.
* Security: A feeling of safety and protection.
* Confidence: A belief in one's own abilities and strength.
If terror refers to a state of extreme violence or fear-inducing actions:
* Harmony: A state of peaceful coexistence.
* Justice: Fairness and impartiality in the treatment of others.
* Compassion: Empathy and understanding for others.
* Love: A deep feeling of affection and care.
Other possible opposites:
* Joy: A feeling of great happiness and contentment.
* Hope: A belief in a positive outcome.
* Trust: A belief in the reliability and integrity of someone or something.
The best opposite for "terror" will depend on the specific context and the intended meaning.