Dota 2/Pugna the Oblivion

Pugna is a ranged intelligence hero who is usually played as a semi-carry and pusher. He is notable for having the highest intelligence growth in the game. He can spam his Nether Blast to rack up damage a lot of damage and even push down towers. He can use Decrepify to alter the state of an enemy, slowing them down and making them more vulnerable to magic. His Nether Ward will punish anyone who dares cast a spell by sending mana flares at them. If Pugna ever finds himself low on health, he can simply use Life Drain to sap an enemy's vitality for himself.

Nether Blast
Nether Blast will do damage to a wide area after a short delay. It deals 50% damage to buildings, and is one of the few spells in the game that does so. With a cooldown of 5.5 seconds, you can spam it for pushes to take out creep waves while chipping down towers. You can also use it as an AoE damage spell during teamfights. The high damage combined with the low cooldown means the damage will rack up quite quickly.
 * Ability: Target Point
 * Damage Type: Magical
 * Damage: 100 / 175 / 250 / 325
 * Blast Delay: 0.9
 * Radius: 400
 * Mana Cost: 85 / 1-5 / 125 / 145
 * Cooldown: 5.5

Decrepify
Decrepify will slow the target, rendering it unable to attack or be attacked and increase the magic damage it takes, similar to an Ether Blast from an Ethereal Blade. It can also be cast on allies but will not slow them. Usually you would want to cast it on an enemy hero whom your team can focus down with magical spells. It can also be used to save yourself or an ally when being targeted by a physical attack dependant enemy, like a carry.
 * Ability: Target Unit
 * Ally Increased Magic Damage: 25%
 * Enemy Increased Magic Damage: 50%
 * Slow: 50%
 * Duration: 2 / 2.5 / 3 / 3.5
 * Mana Cost: 100
 * Cooldown: 12 / 10 / 8 / 6

Nether Ward
Nether Ward makes you place a ward in front of you which will stop mana regeneration and fire mana flares at enemies that cast spells, damaging them based on the amount of mana they used. It can act as a pseudo-silence, since once your enemies realise there's a Nether Ward placed somewhere, they will be more hestitant to cast spells. It's a good idea to put in a hidden location to prevent it from being taken down by enemies.
 * Ability: No Target
 * Damage Type: Magical
 * Radius: 1600
 * Mana Regen: 1.5 / 3 / 4.5 / 6
 * Damage Mult: 1 / 1.25 / 1.5 / 1.75
 * Mana Cost: 80
 * Cooldown: 75

Life Drain
Life Drain will quickly drain the health of the target to heal yourself for 10 seconds, draining mana instead if you're at full health. It is channeled, so you can't move or do anything else when using it. Enemies can also stop the spell by stunning you or by simply moving out of range. Nevertheless, it is still an incredibly useful spell, and you can turn a losing duel into a winning one with a decisive Life Drain.
 * Ability: Channeled, Target Unit
 * Affects: Enemy Heroes
 * Damage Type: Magical
 * Drain Per Second: 120 / 160 / 200
 * Mana Cost: 125 / 175 / 225
 * Cooldown: 22
 * Scepter Drain Per Second: 180 / 240 / 300
 * Scepter Bonus Cast Range: 50
 * Scepter Cooldown: 0

Aghanim's Scepter can be bought by Pugna and will increase the cast range and damage of Life Drain and remove its cooldown.