Holocron

Force Storm

Force power · Level 9 · Dark
power-typeForcelevel9alignmentDarkconcentrationtrue

⟜ Requires Force Lightning Cone

Tweaked from 5eYou already know this as 5e Fire Storm — It's basically Fire Storm — a storm you drop in an area that forces Dex saves and ignites objects — but reskinned to lightning, bumped to a 9th-level slot, and made persistent so anything entering or starting its turn inside eats a punishing 30d6.
Summon a 60-foot lightning storm for 1 minute; creatures entering or starting turns inside take 30d6 lightning on a failed Dex save.
DamageControl
●●breadth · devastating but 9th-level only
TargetingArea
Use whenyou want a persistent zone that punishes enemy movement
ScalingFlat — no higher-slot scaling (already 9th level).
!Dark-side power — carries a corruption cost; requires concentration.
lightningarea-denialenergy
Pairs withForce Lightning Cone (prerequisite) · powers that prevent enemies leaving the zone · high Force save DC build
PlaystyleBlasterController

A crackling storm of lightning with a diameter of 60 feet and a height of 120 feet appears in a location you choose within range. Whenever a creature enters the storm or starts its turn there, it must make a Dexterity saving throw. On a failed save, it takes 30d6 lightning damage or half as much as a successful one.

The power damages objects in the area and ignites flammable objects that aren't being worn or carried.

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