Jecht Beam (ジェクトビーム, Jekuto Bīmu?) is a recurring ability originally from Final Fantasy X. As its name suggests, the ability is associated with Jecht, and typically involves hitting its target with a magic beam.
X Jecht Beam is an attack used by Braska's Final Aeon. It is a magical attack, which has a 100% chance to inflict Petrify (unless the ally it hits is protected against the status) and is a critical +10 attack.
Dissidia012 Jecht Beam is an HP Attack used by Jecht. It can be used in conjunction with Jecht Rush and Jecht Stream in midair, or on its own on ground and in air. On ground, it is obtained at level 12, costs 30 CP to equip (or 15 when upgraded), 130 AP to master, and a priority of Ranged and High. On air, it has similar stats, though its priority is Melee and High, is unlocked at level 28 and