Shadow Thunder is a purple-black lightning add-on for Minecraft Bedrock (latest file: ShadowThunder.mcaddon v1.2).

Transformation: Right-click the orb and lightning strikes you, turning you into a shadow form with dark armor and white eyes for 90 seconds. You get Strength III, Speed III, and 52 health.

Starting skills: Lightning Dash (5 damage plus knockback) and Sky Slam (rise, 3-second charge, ground impact for 20 damage with camera shake).

5-grade gauge: Each kill (mob or player) gives +1 grade.

Grade 1: Faster running.

Grade 2: Lightning blink, up to 10 blocks.

Grade 3: Hold-to-fire lightning orbs, 2 seconds max, 2 damage each.

Grade 4: Ground shock, 5-block radius, freezes targets for 3.5 seconds.

Grade 5: Storm cloud ultimate, 4 damage per second for 8 seconds plus nausea.

At full grade, using a new skill costs 1 grade per cast.

Wings and per-skill pose animations: Added in v1.2.

Status

The skill and grade logic passed simulated tests, but I haven't tried it in the real game.

You reported that the wings and poses don't show up at all. The cause is unknown. I'm waiting on the result of re-adding the packs, your game version, and any Content Log errors.

Custom sound effects are not built yet and are waiting on your decision.