Normally Grock is the Tank hero, but if your team have a very nice tank, and you wanna play Grock, yes you can try the Attacker-Fighter Grock!
You should be careful because your not a durable anymore, you has a damage and attack speed – crit.
You can add your suggestion item by commenting 🙂
Grock Damage, Attacker-Fighter Build
Firstly: Windtalker

+25% Attack Speed
+20 Movement Speed
+20% Critical Strike Chance
Unique Passive – Typhoon: After every 5 basic attacks, the next basic attack must deal 125 magic damage to 3 enemies.
Unique Passive – Activate: Each time Typhoon is cast, one’s movement speed will be increased 5% for a short time.
Then: Swift Boots

+15% Attack Speed
Unique: +40 Movement Speed
Then: Malefic Roar

+60 Physical Attack
Unique: +40% Physical Penetration
Unique Passive – Armor Buster: Basic attack will ignore 20% of a defense turret’s defensive armor.
Then: Scarlet Phantom

+30 Physical Attack
+40% Attack Speed
+10% Critical Strike Chance
Unique Passive – Frenzy: Crit strikes will increase the hero’s attack speed 35% and crit strike rate 5%, lasting 2s.
Then: Berserkers Fury

+65 Physical Attack
+25% Critical Strike Chance
Unique: +40% Crit Damage
Unique Passive – Doom: Crit strikes will increase one’s physical attack 5%, lasting 2s.
Finally: Blade of Despair

+130 Physical Attack
+25% Attack Speed
+10% Critical Strike Chance
Unique Passive – Despair: Deals an extra 10% damage to an enemy in any abnormal state (stunned, knocked airborne, transformed, disabled).
Shortly Attacker-Fighter Items for Grock

Grock Battle Spell
Inspire

Greatly enhances the hero for a short period of time. The next 8 basic attacks will ignore 25 pts of target’s physical defense and increase your hero’s attack speed 55%. Lasts 5s. Cooldown 60.0s
Grock Emblem Set
Physical Emblem Set
Bro malefic roar should be set in #4-#5 slot item, it’s reduce armor base on %, and having it at early or mid game won’t give full potential to it’s effect. Not efficient.