No matter what, right now the Grey ones are extremely vicious for thralls, is like getting them to a multiple arena champion fight. So i would suggest you in Siptah to avoid some conflicts with thralls if they are not fully leveled.

Then on surges things can go easily out of hand. So for surges it’s best to use tier 3 bearers. They seem to gain enormous hp but they don’t hit, they are pure tanks. So train 2 bearers tier 3 and take these fellows on surges, give them coup de grace and kill the rest alone.
A good build is…
20 agil
10 vit
10 grit
20 authority
Fix the primitive heavy + bulked plating
Buffs in encumbrance
Tulwar, shield, Musashi
Carry only the necessary, the bearers can carry the loot and the camel have space for storing legendary weapons. Force buff your bearers for concussion damage.

South with dragons, Vaults, tower (especially in Maelstrom) ruins with skeleton bosses and fractured citadel, are pretty decent to train thralls, avoid npc camps and Grey warrior areas while you train thralls.

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