Mana generation from skills

Looking for advice. Which one is better?
Transplant mana on hit. Movement, but not constant
Rip Blood on hit. Have to cast it a lot
Life Drain channeling mana per second. Minion are required

Depends on your build.

When none of these things really fit into your build Transplant is probably the best if you take detonation on departure and arrival with a little bit of Aoe.

If you use Transplant on bigger mob groups it is giving a big burst of mana without spending much time. Disadvantage is, that you use your traversal skill for pure utility/offense and might not have it ready when needed. If you don’t care about transplants cooldown a lot you can also take the successor Node Pale Blood, which gives you 30 flat mana on Transplant use, but increases the cooldown a lot.

What is your main mana consumption skill? Stacking a little bit of regular mana/sec can work wonders as well.

Maybe a combination of Transplant mana regain and a few mana/sec affixes will do it for you.

Edit: Do you also already lowered your mana cost as much as possible with a well rolled Wand Implicit?
Having 1 or 2 less mana on a skill that you spam does a lot for your mana management.

At this point I’m collecting info, my warlock is too small to give me answers ) trying to find out how utilize autobomb relic after lvling and rebuilding
Probably Life Drain will be best in slot, as 2sec gap in between summon and auto explode may work with mana cost swap to hp cost skill node and hp->ward equipment

Mana from Transplant is meh
As my warlock is developing in another direction - at this point Chaos bolts + auto 0mana cost Rip blood for 9mana per orb (up to 2 rips per sec) works pretty good

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That is odd. This should not work, otherwise I would have suggested this already.

Rip Blood only gives mana when you directly casr it.

Otherwise Transplant could also trigger up to 3 Rip Bloods for extra mana

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Hm. Probably. Mana got stable, but I’ve changed some nodes in chaos bolts too
Upd - confirmed. No mana from rip blood

Another option can be Wandering Spirits ward on spirit expiry, its duration is a bit meh.

Mana is an annoying problem for Chaos bolts you push cast speed to increase damage but increases your mana problems. Regen just doesn’t keep up. The most common solution I’ve seen is -9 mana cost with exalted Firestarters and depending on a T7 legendary is pretty shitty in my opinion.

You don’t though. Actually, you said it in your post:

Mana is part of your DPS. If you run out of mana and can’t cast your spells, your DPS drops. So rather than just pushing cast speed, you have to balance it with your mana regen.

I’m pretty sure that’s the intention of the whole system and not having mana pots. It might need some balancing here and there, but on the whole mana isn’t an issue unless you blindly go for all DPS without paying attention to it.

Devour the Damned node works well with cast speed. Extra projectiles - that is what ruins mana pool