the hydrims got 6 items in total each, 3 items fused together, one item pair merged with HP one with 500 aura, you get the option in the ? in the third zone
fused for HP ( whispering skull+ spyglass) then for 500 aura ( shackles+bonebiter) and finally the one they carry is a (giant shortsword+ banner of energy)
the whispering skull give me an easy bonus for the elemental bonus defense, the heal and early it helped tizik, the spgyglass for tactician 6, shackles for the bulky and the growth of str and defense, bonebiter for the percentage dmg, giant shortsword two hit two enemies, banner of energy to mutually assist for heal and managen