It is a carry hero, I like the idea but I feel that his abilities are too overpowered. Good thing a hero like that doesn't exist in the game.
He is abit strong cuz he has 2 invulnerablities but so does other heroes like Jugg.
Hero name: Berseker
First spell – Blade dance:
The hero goes into a berserk state. Rotating around with his sword granting him spell immunity, Magic damage per second, and movement speed but cannot deal auto attack damage to heroes anymore. Shard up upgrade: He deals auto attack damage to 1 unit.
Second spell – Blood trinket.
The hero puts a moveable trinket on the ground granting 5% hp per second for all friendly units in an area.
Third spell – Slash
Hero has a chance to critical strike at 200% damage
Fourth spell – Frenzy strike
Hero goes in a frenzy dealing damage to random units for X seconds. Hero is completely invulnerable during the time.
Source: https://www.reddit.com/r/DotA2/comments/vvqw6e/new_carry_hero_idea_might_be_too_powerful/