https://pobb.in/Regwr67xFQRN
edit: as pointed out by xaitv the belt is impossible as it uses two mods that share the same mod-group, so it is either/or (concerning 'flask charges gained' and 'reduced flask charges used'). However, flask effect duration is fair game with either of those mods.
I made this for a guild member who wanted to play spiders (we play on HC trade), and figured people may enjoy this build. At first he wanted poison SRS, but the covenant is like 30div on HC trade or something. Please make sure to check out the 'notes' section.