3.26 reddit sauce:

extremely tanky with okay armour depending on flask setup, 90% all res, capped chaos res, block cap with svalinn for 97% or something effective block, capped supression, 100% uptime Progenesis, petrified blood while being full life, depending on tattoos extremely high recovery and you don't need mageblood because tides is mandatory. You can also play it, like i did, with the Ziggurat helmet but you do need pretty specific timeless jewel, escape, 12p 35% minion cluster and the typical doryani setup for merc. It was strong last league when you had to wear Doryani's yourself

https://poe.ninja/builds/mercenaries/character/Avalanche_Potato-3896/藥娘喝生育能生育嗎?i=0&search=class%3DPathfinder%26items%3DThe%2BDark%2BMonarch%26skills%3DRaise%2BSpectre