Grimden’s abilities include Phantom Strider. This provides him with “phantom-like mobility” as well as an increase in stamina and a dodge skill buff. The next ability, Aerial Evasion, has Grimden guarding against attacks from behind while moving behind his enemies.
As for the cloning mentioned earlier, that’s where Million Daggers comes in. This allows the assassin to clone himself and spray daggers in every direction. He can’t be attacked while using this skill, giving him an obvious advantage.
Finally, Lethal Crosscuts uses fast strikes with a blade to eliminate the opposition.