This page shows in what ways Muriel is weak against Gideon. Or in other words what actions should Muriel do to receive minimal damage from Gideon. Note: any hero isn't always strong or weak against another one. It depends on many different factors so please keep that in mind while adding your tip.
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Gideon does not do more damage against Muriel. Counter his slow with your own or your Alacrity and his aoe with yours and she takes less damage than most other heroes. Also Alacrity allows escape from his ult.