I think I have everything Leob/Sale did together, hate Sale is gone.
Anyway, here is my spines/bio. It is expensive but is an aoe machine and not too squishy.
If you only have four slots for attacks, 2 damage, 1 acc, 1 end redux. Unless your end is fine then don't worry about it. I'd not get the two damage auras until your end is fine. It's been a few years but seems like end was an issue on mine until 50.
Toxic Thrax - Scrapper (Spines) 03 10 24 with Ripper 2.mbd