Here's another fun build. With the new Phased Form, Chronos can now run Iron Ward without armor stacking. This goes nicely with the Sacrosanctum recoup package. Furthermore you can scale the Iron Ward damage with big gain as extra mods from a staff.
Among all the spoilers this amulet seems to be flying under the radar. While everyone agrees that it is a very good base, it is in fact the most game changing reveal we've seen so far.
On base level it gives you at best 100 spirit and a skill slot for two amulet mods. This is very very good already, but it does far more than that.
Gear granted reservation skills don't seem to cost spirit even for support gems. This is well known for sceptre skills but you can also see it on Mjolner. You can stack up Vitality II, Cannibalism II, Herbalism II and others on your amulet buff for another free 100+ spirit. The most extreme use would be Blasphemy with 4 curses and heighten curse for 336 free spirit. This will probably be fixed by GGG but it's been here since 0.1 so who knows.
It gives darkness and kaom's heart a spirit skill. This is a total game changer and will open up many builds.
Jonathan did say "spirit skill" in the announcement, not just buffs, so I assume CoX are all possible implicits. This is another game changer. Having two CoX simply doubles the energy gain for a start. Triggering two spells with a single use with minion pact also allows many combos even for attack builds. Imagine each attack of falling thunder triggering living bomb and arc, creating and consuming a lightning infusion to proc infusion of power for a power charge for the next falling thunder. It gets even more interesting with weapon swap, have wolfpack on one weapon set and a couple of brutes on the other, constantly switching between weapons to proc different CoMD spells on each set as you attack. The amount of automation and combos you can pull off will be insane.
Having two less mods actually made it much easier to get BIS mods on the amulet.
There are probably a lot more use cases. I'd imagine this is the new BIS amulet for most builds.
Provided there is enough ward scaling, infernalist is beyond broken. You would need some freeze and stun immunity too but otherwise it's infinite mana CoEA spam again. If there are other ways to convert es to ward you don't even need eldritch battery.
EDIT: You don't even have to go crazy with CI or EB, if you have 1.5k life you can just build max fire res, armor, and armor applies to elemental, which you would normally do anyway. It is easy to take 5% of actual damage after armor and 90% fire res. This will be 75 life for 3000+ effective mana. Together with some life regen it is practically infinite mana.
PoB: https://poe.ninja/poe2/pob/1aedf
T17 Abyss Overrun + Increasing Difficulty + Delirium:
https://www.youtube.com/watch?v=BWR6iQBwt5s
This is my take on the zero duration titan. The zero duration stuff is all well known so I am just going to talk about the tricks and optimizations which can be used in other builds, some of which may survive in 0.5.
The main idea is action economy, which is the amount of stuff that happens every time you press a button. The more action economy you have the more fun the game feels.
Infusion Generation Loop:
We use Wolfpact/CoMD to cast an Orb of Storm every time you use your main skill, and immediately getting a lightning or cold infusion to refund the skill. The best skill on paper is Ice Nova as it gets almost 300% more damage and 125% more AoE when infused. Frost Darts get 50% overall damage (50% base and 3 vs 2 chunks). You can also use Arc for 200% more damage, just don't try Spark with a zero duration setup.
There are lots of random benefits that can be tagged onto this loop. Infusion of Power gives a power charge every cast, we only use this for 29% more crit chance with Charge Regulation, but Lich can also use that for 40% more damage. Essence Harvest gives 8% max mana recoup. Khatal's Rejuvenation gives 40% CDR. Arcane/Vigorous Remnants give 3% mana/life recovery. And if you are a Lich or can spend the power charge each cast (perhaps the Potential support will be reinstated), you could also get 14% mana recovery from the Well of Power cluster.
Weapon Swap:
Weapon swap is essential because with the high cast speed we run out of wolves in a couple of seconds, so we are constantly weapon swapping. For the weapon swap skill low cast time is most important since we have 200% duration instead of 0% duration on weapon set 2 and lose the Time of Need recovery. Mana Tempest and Snap are used. Snap because of the low cast time and enabling Rising Tempest by itself.
Mana Tempest:
Mana Tempest is insane. It snapshots its cost. This means casting spells with life in weapon set 1 will increase the cost of Mana Tempest, which is still paid with mana. This enables Sigil of Power for 58% more damage and Arcane Surge. It also snapshot duration for its support gems, so Arcane Surge will still benefit from 200% increased duration. Our Arcane Surge lasts 40 seconds. Basically we have an entire Stormweaver ascendancy node for free. Finally split 4 on infused Frost Darts is pretty funny. Mana Tempest and Palm solve clear with Frost Darts.
Spellslinger:
Frost darts gets triple damage with ice chunks if target is chilled. We put Frostbolt on Spellslinger to automate screen wide chill and blind application. It's important to hit 150% increased meta energy so that Frostbolt is triggered every 2 casts.
CoC:
This will definitely get nerfed. I'll skip the energy formula calculation because it will be changed. The main reason we use Frost Darts over Ice Nova and Ember Fusillade, besides being a fun skill, is that it works better with CoC. Frost Darts has 13% base crit so it can reach 100% crit fairly easily with Charge Regulation and Blindside, and it has one of the the highest number of hits per cast. At the endgame CoC triggers is actually bottlenecked by the number of hits, since each hit can only proc once and excess energy is wasted. In any case CoC is only really needed for 2 second pinnacle boss kills to skip their mechanics.