Season 15 of Diablo 4 has arrived with a surprise mechanic that caught many players off guard: the Prime Evil system. This new feature brings back the three iconic Lords of Hell (Diablo, Baal, and Mephisto) as playable power sources through their splinters. Since this system directly affects how you level, farm, and progress through the season, picking the right splinter and knowing how to upgrade it can refresh your entire seasonal experience. In this guide, we are going to discuss which Prime Evil Power - Splinter of Evil are the best to choose for different War Plan Trees and activities!
How Does The Prime Evil Return System Work?
The Prime Evil Return system introduces three splinters tied to the three Lords of Hell, each modifying different activities across Sanctuary. Here's what you need to know before committing to a choice.
The Three Prime Evil Splinters
Each splinter connects to a specific Prime Evil and influences the content you run:
Diablo, Lord of Terror (Splinter of Terror): Modifies Hell Tides and the Infernal Hordes.
Baal (Splinter of Destruction): Modifies the Undercity and Lair Bosses.
Mephisto (Splinter of Hatred ): Modifies the Pit and Nightmare Dungeons.
All three splinters also modify the Tree of Whispers, which contains a mix of bonuses from every Prime Evil.
Choosing Your First Splinter
When you receive the quest, you can preview all three options before selecting one. Just head to your character screen and scroll to the end, and the game will show you every splinter's effects before you lock in your pick. Your first choice is not permanent, but you will be locked in for a while until you reach Torment 6, where a quest allows you to swap.
Gaining Reputation
To progress your Prime Evil reputation board and gain more buffs, you need to enter Waking Nightmare Dungeons and slay remnants of evil from the past. Infernal Hordes reward a lot of reputation, and these leaf-marked dungeons appear all over the world map so you can simply walk to them. As your reputation grows, more options and buffs on your board become available.
Upgrading Splinters With The Cube
Splinters drop as blue items on the ground, which is easy to miss if you aren't paying attention. Once you collect enough of them, head to the Horadric Cube, drop them in, and hit transmute to upgrade them to the next tier. Higher-tier splinters offer better options, so keep an eye out for these blue drops since they are socketable items and won't be filtered out of your loot.
With the mechanics covered, let's move on to which Prime Evil powers and splinters actually give you the strongest edge this season.
Diablo 4 Season 15 Best Prime Evil Powers & Splinters
The good news is that the actual proc effects and power boosts on each splinter are nearly identical, so your choice mostly comes down to which content you want to run. Here's a ranking of the three based on how they perform in the current season.
1. Baal Power (Splinter of Destruction) - Best For Early Game & Leveling
Baal's Destruction Splinter is the top pick for the leveling phase, and here's why it takes the crown early on.
Undercity synergy: The Undercity is currently one of the strongest leveling strategies in Season 15. After reaching level 25 and unlocking the Wall Plans, you can spam Undercity runs all the way to level 70.
50% XP bonus: The Destruction Splinter grants a hefty 50% experience bonus on Undercity runs through its seasonal board, giving you a massive edge on XP gains from the achievement rank globes.
Lair Boss perks: Baal also boosts Lair Bosses, with a higher chance for portals to spawn during those fights.
Tree of Whispers bonuses: Extra Whisper ambushes and bonus superior keys help round out the early game farming.
Since Hell Tides and worms received nerfs this season, Undercity has become the most consistent leveling path, making Baal the obvious opener.
2. Mephisto Power (Splinter of Hatred) - Best For Late Game & Paragon Farming
Once you finish leveling and hit the endgame, swap over to Mephisto's Hatred Splinter. This is where the real long-term value kicks in.
Pit meta domination: The Pit is where you level your glyphs and grind Paragon, and Mephisto directly buffs this content. The Hatred Splinter treats your Pit run as if you were 10 tiers higher, making glyph leveling to 150 achievable even on weaker builds.
Extra glyph upgrades: You gain additional glyph upgrades per run, which you can later convert into more XP through the Cornerstone of Souls.
Nightmare Dungeon rewards: Nightmare Dungeons and escalation dungeons drop gem fragments for crafting Flawless Heretic Gems, plus you get extra Wall Bounty chests and higher chances for boss revives.
Treasure altar bonuses: Optional nodes give you treasure goblin altars, adding more loot to your farming routes.
If you plan on grinding Paragon levels, Mephisto is your endgame splinter of choice.
3. Diablo Power (Splinter of Terror) - The Weakest Option Currently
Diablo's Terror Splinter falls behind the other two, mostly because of the content it affects.
Infernal Hordes issue: Diablo boosts Infernal Hordes, but this activity isn't on the same reward tier as other content types, and most players skip it entirely.
Nerfed Hell Tides: With Hell Tides and their maggots nerfed, sitting in overworld farms is less appealing this season.
One redeeming factor: The overworld portals that spawn during Hell Tides are one of the ways to farm Soul Splitters for jewelry sockets, so there is a small niche where Diablo's splinter has value.
Overall though, the Terror Splinter is the one to skip for now.
Splinter Proc Effects Are Nearly Identical
One thing worth noting is that the actual skill procs from each splinter are basically the same in power:
Destruction: Fires an Ice of Exidium (a frozen orb effect).
Terror: Fires a fire-based projectile.
Hatred: Fires a lightning-based effect.
All three procs give 50% primary resource gain, and all three deal a one-time 20% max life damage over 4 seconds on first hit with the seasonal power. Since these baseline effects are identical and cannot be scaled, your decision truly comes down to which Wall Plan bonuses match your playstyle.
Recommended Splinter Path For Season 15
Here's the clean roadmap to follow this season:
Levels 1 to 70: Start with Baal's Destruction Splinter to blast through Undercity runs with the XP bonus.
Torment 6 and beyond: Swap over to Mephisto's Hatred Splinter for Pit farming, glyph leveling, and Paragon grinding.
Optional: Only pick Diablo's Terror Splinter if you genuinely enjoy Infernal Hordes or want to focus on Hell Tide portal farming for Soul Splitters.
Following this progression gives you the smoothest leveling experience early and the strongest farming setup once you hit the endgame, letting you make the most of everything Season 15's Prime Evil Return system has to offer.
