Back Story
Before I dive into everything that I find currently bad about summon wraiths and my possible ideas on how to improve it, I want to add that summon wraiths was hands down one of my favorite all time skills. Ive been making builds based around summon wraiths since patch 0.7.6
Patch 0.7.6 - Necromancer Minion Bleed Build Explained. Can Kill The training Dummy! - YouTube
Patch 0.7.7 - Necro Minion Mayhem Is Back Patch 0.7.7d Last Epoch - YouTube
Patch 0.7.8 - 150,000+ Ward 100 Minions 200+ Wave Necromancer! 0.7.8f Last Epoch - YouTube
Patch 0.7.9 - #1 Build 250+ Minions 900k+ Ward Necro Curse! 0.7.9e Last Epoch - YouTube
Patch 0.7.10 - Ultimate Necro Minion Ignite BUild 0.7.10 Last Epoch - YouTube
Patch 0.8.1 - OUTDATED | Hell's Army. A 200+ minion Necromancer 0.8.1c Last Epoch - YouTube
Patch 0.8.2 - OUTDATED | 100+ Minion with Exploding Zombies and up to 40k Ward 0.8.2 Last Epoch - YouTube
During this 2 year period of playing with wraiths in several different forms, including a melee variant, putrid variant, and flame wraith variant, there have been many viable builds. The biggest issue with the build was Performance which ultimately was due to the sheer number of wraiths that were being made. We knew that this number would very likely be reduced before we ever saw multiplayer!
The Plot Thickens
During the last two years there has been a volley of bugs with several skills and the wraiths themselves that made them to be more than they were.
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Rip Blood - For a Few patches rip blood was able to target ALL minions bring back blood orbs from everything hit which mean if you had 200 minions, 200x the mana and the ward returned to you. This lead to infinite mana and the ability to get to 1 million ward! Rip Blood had this bug fixed though.
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Minion Damage Reflect - When damage reflect was first introduced, you could have each minion reflect up to (IF I RECALL) somewhere around 35% of all damage they took. This meant that if you had 200 wraiths and an enemy did an AOE skill and hit all 200 for 500 damage, that said enemy would have 35,000 damage returned to it. This lead to the BEST EVER damage reflect build in Last epoch but it was short lived and damage reflect was nerfed.
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Putrid/Flame Wraiths Decay Rate - A fix that came to reduce the total number of wraiths was to increase the decay rate, but when this got implemented it only affected the standard melee wraith which meant, you guessed it, nobody even bothered to play with the normal wraith as it just died after casting it before getting to an enemy. Putrid/Flame wraiths however decayed slower and achieving hundreds of them was still possible.
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Drain Life - The final way to achieve such high number with wraiths was to have a source of unlimited mana which is still to this day achievable with drain life. It can give you back over 130 mana per second if you have it hitting 13 minions. THIS IS WHAT SHOULD HAVE GOTTEN NERFED and summon wraiths numbers would have dropped by association.
The Sad Ending
Then Patch 0.8.3 Dropped and ruined summon wraiths altogether. IT HARD CAPPED IT. Now you can only have 6 wraiths by default. 8 maximum when using the skill tree, and 20 maximum with perfect rolled unique + skill tree. AND ONLY 2 IF you dont want them to DECAY. a measly 2.
Why is this bad and what can we do about it?
Well for starters the main problem that a majority of the community felt with the necromancer was having to constantly be re-summoning minions way to often. 2 problems with wraiths in this category
1-PROBLEM) By default the wraiths still decay and they do so at an extremely to fast rate for only being able to have 8 of them. There is also no way to offset this with improvements in gear as the rate of decay is constantly accelerating.
1-SOLUTION)
a - Slow down the decay rate so there not such a hassle
b - Just make them no longer decay by default and add in options to give them certain decay rates in exchange for increasing the maximum number you can have
2-PROBLEM) Damage output VS Maximum Number is in need of serious balancing act. No matter how you build wraiths or which version you have there damage at peak levels can barely compete with what is possible with summon mages and summon skeletons which are permanent minions AND have AoE and skeletons can have as many as 11 PERMANENT minions VS Wraiths 8
2- SOLUTION)
a - Higher the Hard cap of wraiths. 10 By default. Be able to get to 20 Maximum with Tree. 32 Maximum with unique max rolled + Skill tree
b - Give them a damage boost. They should be doing 2-3x the damage they currently do to make up for how much of a hassle they are
c - Make them permanent by default and get ride of the Maximum 2 node.
TLDR
Wraiths (IMO) are in the worst spot that they have ever been. While hard capping their numbers was a must(?) it was capped way to low and they still feel horrible since they decay at way to fast a rate. They require way to much upkeep and hopefully the entire tree gets a rework in the future when the Acolyte class sees its Update like the others.