As of the helmet, legs and boots I recommend using
Terra Helmet,
Fabulous Legs and
Depth Calcei for every of the Pharaohs. If using a one-handed weapon
Gnome Shield is also recommended to be in shield slot.
Ashmunrah: Hits pretty hard with Physical Attacks, beside that, casting Life Drain Wave and deals Death Damage.
Recommendation:
Gill Necklace,
Ornate Chest Plate,
Bone Fiddle
Ring of Souls and a FIRE ELEMENT WEAPON.
Dipthrah: Mostly focused around Life Drain and Mana Drain. As an EK I'd prefer keep my mana high thus I'd go for anti-mana drain EQ.
Recommendation:
Bronze Amulet,
Ornate Chest Plate,
Starlight Vial,
Ring of Souls and an ICE ELEMENT WEAPON.
Mahrdis: Really powerful Physical Attacks as well as really high Fire Damage.
Recommendation:
Magma Amulet,
Fireheart Cuirass for Sword users (note: if you chose different kind of weapon you should buy different kind of armor (+weapon skill) but of the same type (+fire resist). Purchasable from Cledwyn for 100
Silver Tokens),
Sun Catcher,
Enchanted Blister Ring and an ICE ELEMENT WEAPON.
Morguthis: Mostly using Physical Attacks as well as Death Damage.
Recommendation:
Gill Necklace, 
Ornate Chest Plate,
Moon Mirror,
Butterfly Ring and an EARTH ELEMENT WEAPON.
Omruc: Using Physical Attacks as well as Fire and Earth Damage. This boss is quite weak.
Recommendation:
Gill Necklace,
Ornate Chest Plate,
Sun Catcher,
Enchanted Blister Ring and an ICE OR ENERGY ELEMENT WEAPON.
Rahemos: This one focuses his damage around Physical, Death, Energy and Life Drain what makes him quite difficult opponent.
Recommendation:
Prismatic Necklace,
Thunderheart Cuirass for Sword users (note: if you chose different kind of weapon you should buy different kind of armor (+weapon skill) but of the same type (+fire resist). Purchasable from Cledwyn for 100
Silver Tokens),
Bone Fiddle,
Prismatic Ring and a PHYSICAL DAMAGE WEAPON.
Thalas: Heavy Physical Attacks and high Earth Damage.
Recommendation:
Exotic Amulet,
Earthheart Cuirass for Sword users (note: if you chose different kind of weapon you should buy different kind of armor (+weapon skill) but of the same type (+fire resist). Purchasable from Cledwyn for 100
Silver Tokens),
Bone Fiddle,
Ring of Souls and an ICE OR FIRE ELEMENT WEAPON.
Vashresamun: Her Physical Attacks aren't that strong so it's best to focus around Death Resistance and prepare for Life Drain.
Recommendation:
Necklace of the Deep,
Ornate Chest Plate,
Moon Mirror,
Butterfly Ring and a PHYSICAL DAMAGE WEAPON.
I hope these tips will be useful to all of you in the future and maximize your grind rate. 