Decrease Speed Debuff is a great skill in Raid Shadow Legends to help your team gain a turn meter advantage and enable you to get more turns than your enemy! Decrease speed is a  skill mainly used against waves of enemies in the Arena, Dungeons, Faction Wars, and Doom Tower. This skill is very strong against some bosses such as Spider, Ice Golem, Fire Knight, Sorath the frost spider, Borgoth and Agreth!