Sword Elites (Halo: Reach)

There are Elites with Energy Swords throughout the Halo: Reach Campaign. They are capable of killing the player with one slash.

Golden Elite on Legendary (Winter Contigency)
Before fighting the Zealots inside the base, on Legendary, there would be a Golden General Elite with an Energy Sword deployed via the final Spirit. It is the players choice if they want to kill the Elite or leave him.

Zealot Elite (Winter Contigency)
Two Zealots under the command of one Field Marshal lead the Covenant forces inside the base and one of the Zealots have a sword. The Zealot is seen at the final part where he is guarding the Field Marshal. But both the Zealot and the Field Marshal has to be killed.

Zealot Elite (Tip of the Spear)
Theres a Zealot during Tip of the Spear where, if he goes outside, he'll pull out his sword. It is the players choice for him to be killed.

Ultra Elite (Tip of the Spear)
Once the player gets on top of the Spire, an Ultra Elite is waiting with an Energy Sword. He has to be killed in order to complete the mission.

SpecOps Elite (Long Night of Solace)
On Legendary, inside the Bridge, one of the SpecOps Elites who are working the ship will pull out his sword once his attacked or notices the enemy. He must be killed to proceed

General Elite (The Package)
There will be a General Elite on the last part of The Package. He can be killed or not.

Ultra Elite (Pillar of Autumn)
An Ultra Elite will be present in the Pillar of Autumn mission. He can be killed or not.

Field Marshal/Zealot (Pillar of Autumn)
There is a group of Field Marshals and Zealots during the final part of Pillar of Autumn. If they need a backup weapon, they'll pull out their Energy Swords.

General Elite (Lone Wolf)
During Lone Wolf on Legendary, a General will spawn with an Energy Sword who can be killed or not. Towards the end of Lone Wolf, theres a group of Elites with Swords who team up on and kill Noble Six. Then one Elite with his sword stands by and watches, people says its the Arbiter.