# Prime Evil Iconic Powers are a genuinely 'free' uptime engine - they trigger automatically with no resource cost or input required

The season's Prime Evil Splinter grants a periodic, automatically-triggering damage proc that requires no cast, no resource spend, and no Lucky Hit roll - just carrying the Splinter and progressing its reputation track for stronger upgrades over time.

Diablo IV patch 3.2.1. Category: uptime loop. Evidence: Likely.

## Detail
Because it fires on its own timer rather than off player input, it stacks its uptime 'for free' on top of whatever active rotation a build is already running, and later reputation-rank upgrades add secondary effects (resource generation, Vulnerable application, extra triggers during a temporary window like 'Rapture of Fear' after a kill) that compound with the base proc rather than replacing it.

## Why it works
The mechanic is explicitly designed as a passive background system (a seasonal analog to older 'Angelbreaker'/season-mechanic auto-procs), separate from the character's own skill-cooldown or Lucky-Hit economy entirely.

## How to use it
Because it costs nothing to maintain, prioritize whichever Splinter's damage type and activity-modifiers best match your own build/farming route rather than treating the choice as purely a DPS-maximizing decision - see season15_prime_evil_splinter_choice.