Advice on how to build a bane

The title says it all.

Hmm, let's see I'd start out by making sure that my toggles, particularly leadership and fighting are slotted with a good mix of endurance and defense. I'd take Cardiac Core Paragon for my Alpha to help with the endurance issues, but Agility Core Paragon might work too, if you're good on endurance usage and are looking to boost your recharge and defense a bit more. I'd also look to get Melee, Ranged, AoE, Smashing, and Lethal to at least 45% for softcapping. Oh and get your Smashing and Lethal Resistance as close to 45% as you can. Also for your Destiny slot, I'd take Rebirth Core Epiphany, since unlike a Crabspider, you don't have Serum to heal you. Here's what I'm looking to do for my crabspider's secondary build. It's not yet finished as I don't have the Spider's Bite set slotted yet. As for a Hybrid Slot? I really haven't decided just yet as to which would be best. And I might change some slotting. But, it'll give you an idea of slotting and power selection:

Villain Plan by Mids' Villain Designer 1.956
http://www.cohplanner.com/

Click this DataLink to open the build!

Devil's Wrath Remake: Level 50 Natural Arachnos Soldier
Primary Power Set: Bane Spider Soldier
Secondary Power Set: Bane Spider Training
Power Pool: Leaping
Power Pool: Speed
Power Pool: Fighting
Power Pool: Leadership
Ancillary Pool: Mace Mastery

Villain Profile:
Level 1: Bash -- C'ngImp-Acc/Dmg:50(A), C'ngImp-Dmg/Rchg:50(3), C'ngImp-Acc/Dmg/Rchg:50(3), C'ngImp-Acc/Dmg/EndRdx:50(5), C'ngImp-Dmg/EndRdx/Rchg:50(5)
Level 1: Bane Spider Armor Upgrade -- S'fstPrt-ResDam/Def+:30(A), S'fstPrt-ResKB:30(7)
Level 2: Wolf Spider Armor -- ImpArm-ResDam/EndRdx:40(A), ImpArm-ResDam:40(7), ImpArm-ResPsi:40(34)
Level 4: Combat Jumping -- S'dpty-Def/EndRdx:40(A), S'dpty-Def/EndRdx/Rchg:40(13)
Level 6: Build Up -- RechRdx-I:50(A), Rec'dRet-Pcptn:20(9), RechRdx-I:50(9)
Level 8: Super Jump -- Jump-I:50(A)
Level 10: Tactical Training: Maneuvers -- LkGmblr-Rchg+:50(A), RedFtn-Def/EndRdx:50(11), RedFtn-Def/Rchg:50(11), RedFtn-Def/EndRdx/Rchg:50(13), RedFtn-EndRdx:50(15), RedFtn-Def:50(31)
Level 12: Pulverize -- SDoArach-Acc/Dmg:50(A), SDoArach-Dmg/Rchg:50(19), SDoArach-Acc/Dmg/Rchg:50(21), SDoArach-Dmg/EndRdx/Rchg:50(21), SDoArach-Acc/Dmg/EndRdx/Rchg:50(23)
Level 14: Poisonous Ray -- Decim-Acc/Dmg:40(A), Decim-Acc/Dmg/Rchg:40(15), Decim-Acc/EndRdx/Rchg:40(17), Decim-Dmg/Rchg:40(23)
Level 16: Hasten -- RechRdx-I:50(A), RechRdx-I:50(25), RechRdx-I:50(25)
Level 18: Shatter -- Empty(A), Empty(29), Empty(29), Empty(31), Empty(31), Empty(36)
Level 20: Tactical Training: Leadership -- AdjTgt-ToHit:50(A), AdjTgt-ToHit/Rchg:50(27), AdjTgt-ToHit/EndRdx/Rchg:50(33), AdjTgt-ToHit/EndRdx:50(33), AdjTgt-EndRdx/Rchg:50(33)
Level 22: Mental Training -- Run-I:50(A)
Level 24: Cloaking Device -- GftotA-Def/EndRdx:40(A), GftotA-Def/EndRdx/Rchg:40(34), LkGmblr-Def/EndRdx/Rchg:50(43), LkGmblr-Rchg+:50(45)
Level 26: Placate -- RechRdx-I:50(A), RechRdx-I:50(27)
Level 28: Surveillance -- ShldBrk-Acc/DefDeb:30(A), AnWeak-Acc/DefDeb:50(36), HO:Lyso(37)
Level 30: Boxing -- Amaze-Stun:50(A), Amaze-ToHitDeb%:50(34)
Level 32: Crowd Control -- Armgdn-Dmg:50(A), Armgdn-Dmg/Rchg:50(39), Armgdn-Acc/Dmg/Rchg:50(39), Armgdn-Acc/Rchg:50(40), Armgdn-Dmg/EndRdx:50(40), Armgdn-Dam%:50(42)
Level 35: Tough -- GA-3defTpProc:50(A), ImpArm-ResDam/EndRdx:40(36), ImpArm-ResDam/Rchg:40(37), ImpArm-ResDam/EndRdx/Rchg:40(37), ImpArm-ResDam:40(40)
Level 38: Weave -- GftotA-Def/EndRdx:40(A), GftotA-Def/EndRdx/Rchg:40(39), LkGmblr-Rchg+:50(42), SW-ResDam/Re TP:50(50)
Level 41: Mace Blast -- Apoc-Dmg:50(A), Apoc-Dmg/Rchg:50(42), Apoc-Acc/Dmg/Rchg:50(43), Apoc-Acc/Rchg:50(43), Apoc-Dmg/EndRdx:50(45), Apoc-Dam%:50(48)
Level 44: Shatter Armor -- Hectmb-Dmg:50(A), Hectmb-Dmg/Rchg:50(45), Hectmb-Acc/Dmg/Rchg:50(46), Hectmb-Acc/Rchg:50(46), Hectmb-Dmg/EndRdx:50(46), Hectmb-Dam%:50(50)
Level 47: Maneuvers -- GftotA-Def/EndRdx:40(A), GftotA-Def/EndRdx/Rchg:40(48), LkGmblr-Rchg+:50(50)
Level 49: Tactical Training: Assault -- EndRdx-I:50(A)
Level 1: Brawl -- Acc-I:50(A)
Level 1: Sprint -- Run-I:50(A)
Level 2: Rest -- Heal-I:50(A)
Level 1: Conditioning
Level 0: Born In Battle
Level 0: High Pain Threshold
Level 0: Invader
Level 0: Marshal
Level 4: Ninja Run
Level 2: Swift -- Run-I:50(A)
Level 2: Hurdle -- Jump-I:50(A)
Level 2: Health -- Mrcl-Rcvry+:40(A), Numna-Regen/Rcvry+:50(17), Panac-Heal/+End:50(19)
Level 2: Stamina -- P'Shift-EndMod:50(A), P'Shift-End%:50(48)
Level 1: Prestige Power Slide -- Empty(A)
Level 1: Prestige Power Dash -- Empty(A)
Level 1: Prestige Power Quick -- Empty(A)
Level 1: Prestige Power Surge -- Empty(A)
Level 1: Prestige Power Rush -- Empty(A)
Level 50: Diamagnetic Radial Flawless Interface
Level 50: Arachnos Core Superior Ally
Level 50: Rebirth Core Epiphany
Level 50: Cardiac Core Paragon
Level 50: Ion Radial Final Judgement
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Bane Spiders can do a lot of different things well, and there are different types of builds. What do you see your Bane doing?
Will he start each combat by surprising his hapless victims with Executioner's Strike? Or spraying the room with toxic damage and debuffs? Will he mop up with melee attacks? Ranged mace attacks? SMG attacks? Pets?

My own Bane Spider is 100% mace attacks and he operates much like a Stalker, except that he has useful ranged attacks, and pets, and and better Leadership toggles than any Defender.

I generally team with my Bane, and use this play style on each group of enemies:

Step 1) Little prep work. Make sure all toggles are running. Summon pets if available. Pick something ugly and Surveillance it.

Step 2) AoE attacks! Open with the venom grenade, and follow up with whatever I have available until most the weaker stuff is defeated. Depending on team kill speed this may be right after the venom nade, or may require burst/frag/bile/whatever. I've found two more AoEs to be sufficient most of the time.

Step 3) Switch to melee and finish off survivors. Placate a boss and shatter it, whatever, whip out that mace and start smashing faces in.

This is very fun and I really feel like I'm helping the team, from start to finish.

I'd like to apologize, been somewhat busy with real life. I will leave a better response later to some of the questions.