Hazrad by MagicPants

Tier 1:

Evolved Carapace: Quest: Take a total 6000 damage without dying. Reward: Gain an extra 20 armor reducing the damage you take by 20%.

Reaver's Rampage: Quest: Hit enemy heroes with basic attacks 30 times. Reward: Your basic attack damage is increased by 25%.

Dominating Presence: Quest: Slow enemy heroes with Constricting Slime for a total of 40 seconds. Reward: Constricting Slime's radius is increased by 25% and its cooldown is reduced by 5 seconds.

Tier 2:

Ravage the Weak: Using Consume DNA on an enemy minion will instantly kill it and heal you for 100% of the damage dealt.

Coagulating Slime: The slow amount is increased to 30%.

Mercenary Lord: Friendly non-Boss Mercenaries near your Hero deal 50% more damage. Gain 50 Armor against Minions and Mercenaries, reducing the damage taken by 50%.

Tier 3:

Savage Strike: Hitting an enemy hero with a basic attack will mark them for 6 seconds. If your next basic attack hits the same hero while the mark is active, it will deal 100% additional damage.

Corrosive Slime: Constricting Slime reduces the Physical Armor of affected enemies by 2 every second and for 2 seconds after.

Follow Through: After using an Ability, your next Basic Attack within 6 seconds deals 40% additional damage.

Tier 4:

Vicious Charge

Behemoth

Tier 5:

Ravage Essence: Using Consume DNA on an enemy hero will deal an extra 10% of their max health as damage.

Debilitating Slime: Constricting Slime increases enemy heroes' cooldown recovery by 20%.

Hybrid Rage: Deal 30 (+4% per level) damage per second to nearby enemies while Increased Aggression is active. Killing or destroying an enemy target while under the effect of Increased Aggression will reset its duration.

Tier 6:

Assimilation: Your basic attacks heal you for 40% of their damage dealt.

Perfect Organism: Activate to increase your health regen by 500% for 20 seconds. Cooldown: 30 Seconds.

Imposing Presence: Activate to slow the Attack Speed by 50% and Movement Speed by 20% of nearby Heroes and Summons for 2.5 seconds. Passive: Heroes and Summons that attack your Hero have their Attack Speed slowed by 20% for 2.5 seconds.

Tier 7:

Force of the Reaver: The knock back of Vicious Charge is increased by 100%.

Final Evolution: Behemoth transformation is no longer lost on death and your basic attacks splash for 75% damage.

Unstoppable Force: You can no longer be silenced or put to sleep.

Total Annihilation: Activate to instantly kill all allied and enemy minions, monsters and mercs (including bosses) on the map. Will not affect heroic targets, objective based monsters or monsters summoned through Abilities. Cooldown: 400 Seconds.

Strong Against:

Warriors: Anub'Arak, Arthas, ETC, Muradin, Stitches, Varian

Assassins: Illidan, Jaina, Kerrigan, Ragnaros, Samuro, The Butcher, Thrall, Valeera, Varian

Support: Malfurion, Rehgar, Uther.

Specialist: Murky, TLV, Xul.

Weak Against:

Warriors: Artanis, Dehaka, Diablo, D'va, Garrosh, Johanna, Leoric, Zarya.

Assassins: Cassia, Chromie, Greymane, Hanzo, Junkrat, Lunara, Malthael, Raynor, Tracer, Tychus, Zeratul.

Support: Ana, Brightwing, Lili, Tyrande (due to mark).

Specialist: Medivh, Probius, Sylvanas, Zagara

I created this concept as Blizzard has teased this character for some time now but he still has not been released. My concept has him as a slow moving high health brawler. He does NOT fulfil the role of a true tank as he lacks peel which is key for a true tank. He does have a powerful AOE slow to help him lock down heroes that venture close. He also deals massive basic attack damage but at the cost of a slow attack speed and slow base movement. His ultimates are down to what is needed in the team. Vicious Charge gives him peel which is his main weakness and it can serve as an escape in emergencies. Behemoth on the other hand capitalises on his strengths instead, increasing both his health and damage. His trait is powerful too making him immune to slows, stuns and roots and giving him huge armor when amongst heroes. This can be improved further with his level 20 talent Unstoppable Force, making him immune to silences and sleep effects as well. However for all his strength, he is weak against heroes that do a lot of poke and he is very weak against heroes that attack max health and armor such as Malthael, Hanzo and Tychus. Also, he is not immune to knock backs and displacement effects. This means heroes like Diablo, Garrosh and Junkrat can easily disrupt his positioning, while Zarya, Maiev, Anub'Arak, and Zagara have powerful ultimates that can remove him from battle. He is also affected by Mosh Pit.
His level 20 talent, Total Annihilation can be used to "reset" all lanes in an emergency, but it comes with a hefty cooldown as a result. It will have zero effect on objective monsters or monsters summoned through abilities nor will it have any affect on uncaptured camps. The exception here is Braxis Holdout, I think it would be ok to wipe enemy zerg rushes as this would be no different to a double lava wave from Ragnaros.

In summary, he is a Warrior with the aim of teaching players to focus on his team mates rather than him and punish teams that try to focus him first in team fights. Also, even though he has a huge health pool and high damage, he moves slower than other heroes requiring good positioning and good map knowledge in order to reach objectives in time. This makes him good on smaller maps or maps with one objective, such as Volskaya Foundry or Braxis Holdout but weak on large maps or maps with multiple objectives such as Warhead Junction and Blackheart's Bay.

Strengths:

-Huge Health pool.
-Massive Armor boost when near multiple heroes and with talents.
-Large Basic Attack damage make a him a threat to even the tankiest of enemies.
-Immune to stuns, slows and roots give him incredible team fight presence.
-Self healing gives him great sustain.
-Can stick to heroes that lack escape.
-Hard to manage and lock down for the enemy.

Weaknesses:

-No hard CC until level 10.
-Slow movement speed can be a hindrance in many situations.
-Is still affected by silence and sleep effects until 20.
-Still affected by polymorph, displacement effects and skills that remove a player from battle.
-Large health pool and armor makes him at risk from heroes that target max health and armor.
-He has very high damage with basic attacks, but blinds completely shut his damage down.
-Poor at dueling.