I’m not sure how low hp zealot build would be any good if even with 100 toughness the damage bleed through into health. I thought it was a safety net kind of how like it works with zealot in vermintide and thp. I didn’t play long enough or get the grasp of that but using feats that are centered around martydom seem very unlikely to be viable at all.
Many things are built around “get smacked and get stronger” but if toughness isn’t exactly saving from getting downed at low hp then what is?