To be created a bench that you can fuse Thrall together until Tier 4 (Tier 3 to be max you can fuse)
Thrall should be the same one with the other for it to can be fused ( with same i mean same job as : Taskmaster / bLACKSMITH etc not same race/look but only job)
So Tier 1 Thrall Taskmaster + Tier 1 Thrall Taskmaster = Tier 2 Thrall Random taskmaster
T2 Fighter + T2 Fighter = T3 Fighetr
T3 Fighter + T3 Fighter = Cannot fuse further (max to be Tier 3 you can fuse that way to be balance for Surge summon system)
Rest can think the devs if they add cost to each fuse or not , all thrall can be fuse if same job until T3 after T3 cannot fuse anymore .