This is the build my Widow had getting to 24:
Villain Plan by Mids' Villain Designer 1.803
http://www.cohplanner.com/
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Level 23 Natural Arachnos Widow
Primary Power Set: Widow Training
Secondary Power Set: Teamwork
Power Pool: Leaping
Power Pool: Fitness
Villain Profile:
Level 1: Swipe -- Acc-I(A), Acc-I(3), Dmg-I(7), Dmg-I(13)
Level 1: Combat Training: Defensive -- DefBuff-I(A), DefBuff-I(11), DefBuff-I(11)
Level 2: Strike -- Acc-I(A), Acc-I(3), Dmg-I(7), Dmg-I(13)
Level 4: Tactical Training: Maneuvers -- DefBuff-I(A), DefBuff-I(5), DefBuff-I(5), EndRdx-I(15)
Level 6: Combat Jumping -- DefBuff-I(A)
Level 8: Follow Up -- Acc-I(A), Acc-I(9), Dmg-I(9), Dmg-I(15)
Level 10: Indomitable Will -- EndRdx-I(A), S'fstPrt-ResDam/Def+(21)
Level 12: Hurdle -- Jump-I(A)
Level 14: Super Jump -- Jump-I(A)
Level 16: Lunge -- Acc-I(A), Acc-I(17), Dmg-I(17), Dmg-I(21)
Level 18: Health -- Heal-I(A), Heal-I(19), Heal-I(19)
Level 20: Stamina -- EndMod-I(A)
Level 22: Foresight -- DefBuff-I(A), DefBuff-I(23), DefBuff-I(23)
Level 24: [Empty]
Level 26: [Empty]
Level 28: [Empty]
Level 30: [Empty]
Level 32: [Empty]
Level 35: [Empty]
Level 38: [Empty]
Level 41: [Empty]
Level 44: [Empty]
Level 47: [Empty]
Level 49: [Empty]
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Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Conditioning
Level 4: Ninja Run
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Maneuvers is a priority power, and end cost will be fairly high (Need to pop blues every now and then) after 22 defence becomes pretty nice.
Also purples > greens after a bit of defence.
Just a couple tips to consider:
It's not the toggles from the Widows that hog endurance; it's the attacks themselves. Training: Maneuvers costs the same amount of endurance as the shields/armors in other melee secondaries (0.21 EPS). Again, that's the Maneuvers in your Secondary and not the Power Pool version. Most attacks in the Widow path, however, do high damage and thus have a higher corresponding endurance and recharge to offset the damage than early attacks in some other sets.
As far as leveling is concerned, I think it helps to build to your strengths (good damage) and remember that most defense-based melee sets are risky early on because good defense doesn't come until the mid-later levels. With that being the case though, pick up your defense powers and be sure to slot your attacks for damage to make the most of their endurance costs.
Another thing to remember is that you won't have to use up those early slots for Fitness Pool once Issue 19 goes live. If you can live without it for now and slot some Endurance Reduction, you'll find it all the more rewarding to actually get to pick other powers instead of the Fitness Pool.
I'd recommend Combat Training: Offense (Passive +Accuracy, ToHit Debuff Res) for use before level 24 (you can use the mandatory Respec to drop it at that time if you want) to offset any accuracy woes and just slotting some Endurance Reduction in your attacks wherever you would have slotted Accuracy.
Combat Training: Accuracy will also help you with ToHit debuffs, which happens a lot when you face early Circle of Thorns Spectrals.
Veridian Dynamics. Mistakes. We all make them. But sometimes mistakes lead to great discoveries. Mistakes are how we learn and grow... so we can do amazing things.
When you think about it, shouldn't you be thanking us for making mistakes? Veridian Dynamics. We're sorry. You're welcome.
Is there any agreed-upon method buildwise to getting to 24 as a blood widow? Like what powers are worth taking on the way and what's not?