The attack first appeared in episode 33. Sailor Venus first used it in order to give Tuxedo Mask a chance to escape from Zoisite's attack. Later in the episode, she used Crescent Beam again to break Kunzite's barrier, freeing Sailor Moon, Sailor Mercury, Sailor Mars and Sailor Jupiter.
When Sailor Venus performed this attack in the anime, two crescent moons collided above her head before she raised her right index finger up to touch them. She lowered her right arm to point at her target as her left arm came to rest on her elbow, then shot a beam of light from her index finger.
Crescent Beam first appeared in the first act of the Codename: Sailor V manga, "The Birth of Sailor V!". After she caught Narkissos, a member of the Dark Agency, hypnotizing a girl named Haneda as part of her efforts to turn young girls into his slaves, Minako Aino transformed into Sailor V. After engaging in a fight, Sailor V was instructed by Artemis to use her compact to reveal his true form and destroy him. Sailor V cast Crescent Beam with her compact, destroying Narkissos and returning the hypnotized young girls to normal.
When she performed the attack in the Codename: Sailor V manga, Sailor V held her compact to face the enemy, letting its mirrors reflect its true form, and shouted, "Crescent Beam". A flash of light would then emit from the compact, killing or wounding her enemy her enemy. In some cases, she would wave the compact in an arc above her head while performing the attack.
Pretty Guardian Sailor Moon
There is no official Crescent Beam attack in the live-action series, however there is a very similar attack simply called Venus Beam.
Sailor Venus used this attack often in the musicals, and there performed it in a similar fashion to the attack sequence in the anime. She raised her finger in the air, then pointed it toward her target to release the attack.
Crescent Beam appeared in many Sailor Moon video games, including Sailor Moon (Super Fiacom), Sailor Moon (Mega Drive), Sailor Moon S (3DO), Sailor Moon S: Jougai Rantou!? Shuyaku Soudatsusen, Sailor Moon SuperS - Various Emotion (Sega Saturn), Sailor Moon SuperS: Shin Shuyaku Soudatsusen (Playstation), Sailor Moon: Another Story (Super Famicom), and the Pretty Soldier Sailor Moon arcade game. Since all of these games were based on the Sailor Moon anime and manga series, their renditions of Crescent Beam were based on the anime rather than the Codename: Sailor V manga.
In Sailor Moon: Another Story, Crescent Beam was referred to as Sailor Venus's "Holy Light," a power capable of causing earthquakes. It was said not to have originally been meant for destruction. In that game she used it to restore the people of Rias Village who had been turned to stone.