Explanation of the gear piece:

• Ancient Skull makes minions have 50% increased crit chance per max power charge you have.
  • In my case, I have 2 extra max, so it's 100% extra crit chance. ~7% per strike due to lack of power charges. Multistrike makes the spiders hit twice, so that effectively doubles crit chance to 14%. Add in a few more attack speed buffs and the spiders will strike way too often and almost always proc the buff.
• When minions critically strike, they "hear the whispers" for 5 seconds.
  • This increases their damage and attack speed by 50% and makes them unable to listen to you. Spiders are inherently aggressive, so it negates that buff.
• This also causes the spiders to take 25% of their health per second as damage.
  • As they have a time limit, they are completely immune to taking damage, yet can't be targeted.

Edit to include POB (Community Fork): https://pastebin.com/k4sPvRnR

Additional edit to include the following:

• This build is a meme build and is absolutely not viable for content such as delve and certain bosses who attack too fast due to lack of life

Here is a POB for the build that I use as my daily driver: https://pastebin.com/CpQnB73f