Just read okun's catalyst item mods. Literally everything is a qol boost. Innate: allows u to cast ball lightning while moving, huge attack speed increase, dr with balls, +ball lightning, balls orbit (like gravitational aspect once did), chance to cast 2 ball lightning.... it's one of those items you just put on and games easier since you're plowing through everything already. Ngl if you're pit pushing, lightning spear beats ball lightning. Yes the focus sacrifices a slot for 2h aspect duh. If you run lightning spear and have no flexibility and must absolutely follow the recommended guide, yes use the 2h staff with int life crit dmg and temper lightning % double damage and more crit because damage. You can probably place okuns catalyst in a starter build while waiting to farm that 2h staff. Okuns is easy to farm and 1h weaps drop like candy. The 1h setup lowers required attack speed to hit breakpoints so it's easier again for starters. Hope that answers the why 1h debacle