It’s first problem is that recasting the skill resets the skeletons rather than adding more. Pre-rework you could have a ton of skeletons and have an actual army if for like half a second…
Post rework you can more consistently have more than your basic cap of skeletons…for like 20 seconds.
Secondly…the skeletons need to achieve a purpose. Are they supposed to do damage? Narrow blades and Seneschal does that better. Are they supposed to tank for you? Seneschal and their boosted health does that better. What does that leave them with beyond 20 seconds of “free” overcharge fodder? The skeletons achieve something thanks to the bonuses from barrow blades and dread seneschal.
And beyond that, 20 second of a few extra skeletons, even IF they were useful, is very useless. That’s closer to a lower level talent. If you insist in the current iteration, FS needs to add something more to the talent like they did for Seneschals. What does Seneschal add? 1) tougher+harder hitting skeletons AND 2) a disruptive charge and shields for dedicated defenders. Army of the Dead? 1) 20 seconds of a few more skeletons and… 2)???. What will it be? Maybe a bonus that benefits from the increased quantity of skeletons or a passive that lets Sienna earn more skeletons when the skill is on cooldown? Maybe give Sienna a new skeleton every 5 kills or every elite/special killed? Give it something to facilitate an “army of the dead”
TL;DR -
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What is the purpose of the 20 seconds of extra skeletons? The effect is currently useless because the skeletons don’t do anything impactful.
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Even if they were impactful, 20 seconds doesn’t allow any differences to be made.
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The talent needs to facilitate its namesake. Even if a literal army isn’t feasible, perhaps it could be reworked to a point where the quantity of skeletons is maintained more consistently than the other two talents? Maybe a secondary method of generating skeletons or a passive bonus that benefits from having tons of skeletons?