Holocron

Mass Hysteria

Force power · Level 9 · Dark
power-typeForcelevel9alignmentDarkconcentrationtrue

⟜ Requires Hysteria

Tweaked from 5eYou already know this as 5e Weird — This is your Weird — same 9th-level mass nightmare in a 30-ft sphere that frightens and deals psychic damage each turn, just bumped to 5d10 and checked at the end of the turn (and useless against droids/constructs).
Frighten every creature in a 30-foot sphere for 1 minute; frightened targets take 5d10 psychic damage each turn on failed Wisdom saves.
ControlDamage
○○breadth · droids/constructs immune; save-ends
TargetingArea
Use whenfacing a large organic group vulnerable to fear effects
ScalingFlat — no higher-slot scaling (already 9th level).
!Dark-side power — carries a corruption cost; requires concentration; droids and constructs are completely immune.
psychicfearmind-affectingcontrol-condition
Pairs withHysteria (prerequisite) · abilities imposing disadvantage on Wisdom saves · dark-side Force caster build
PlaystyleControllerBlaster

Drawing on the deepest fears of a group of creatures, you create illusory creatures in their minds, manifesting their worst nightmares as an implacable threat visible only to them. Each creature in a 30-foot-radius sphere is frightened for the duration of the power. At the end of each of the frightened creature's turns, it must succeed on a Wisdom saving throw or take 5d10 psychic damage. On a successful save, the power ends for that creature. This power has no effect on droids or constructs.

Codex
Casting Period
1 action
Range
120 feet
Duration
up to 1 minute
Concentration
Yes