Dota 2/Lina the Slayer

Lina is a ranged intelligence hero that is usually played as a support. Lina can possibly be considered a glass cannon, with spammable abilities that can rack up damage quickly but suffers from being very fragile. Her Dragon Slave and Light Strike Array have very short cooldowns letting her unleash a constant barrage of damaging spells. She can be a great rightclicker with her Fiery Soul. Finally, her ultimate, Laguna Blade, is one of the most damaging target unit abilities in the whole game.

Dragon Slave
Dragon Slave sends out a blast of fire that damages enemies in its path. With a cooldown of merely 8.5 seconds, this ability is very spammable. It is quite adept at clearing creep waves, so a useful tool when your team is pushing.
 * Ability: Target Unit, Target Point
 * Affects: Enemy Heroes
 * Damage Type: Magical
 * Damage: 100 / 170 / 230 / 280
 * Mana Cost: 90 / 105 / 125 / 140
 * Cooldown: 8.5

Light Strike Array
Light Strike Array creates a column of fire that stuns enemies in the designated area. It has a casting delay, so you have to predict where the enemy might be or just use it after an ally with a more reliable stun has disabled the enemy. With an even smaller cooldown at 7 seconds, this ability is very spammable. It is also a great setup into your Dragon Slave to do more damage.
 * Ability: Target Point
 * Damage Type: Magical
 * Damage: 90 / 150 / 210 / 280
 * Radius: 225
 * Cast Delay: 0.5 seconds
 * Stun Duration: 1.6
 * Mana Cost: 90 / 100 / 110 / 125
 * Cooldown: 7 seconds

Fiery Soul
Fiery Soul grants Lina bonus movement speed and attack speed for 7 seconds every time she casts an ability. It can stack up to 3 times with itself. With the low cooldowns of your abilities you can trigger it several times during a teamfight, and it does make you a potent autoattacker while your spells are cooling down.
 * Ability: Passive
 * Attack Speed Bonus: 40 / 55 / 70 / 85
 * Move Speed Bonus: 4% / 5% / 6% / 7%
 * Max Stacks: 3

Laguna Blade
Laguna Blade is one of the most powerful target unit abilities in the game. It deals a humongous amount of damage to a single unit, high enough to take off a considerable chunk of health off of a hero, and sometimes even one-hit weaker heroes. Great for softening up a tanky carry or to take out a powerful support.
 * Ability: Target Unit
 * Affects: Enemy Heroes
 * Damage Type: Magical
 * Damage: 450 / 675 / 950
 * Scepter Damage: 600 / 925 / 1250
 * Scepter Range: 900
 * Mana Cost: 280 / 420 / 680
 * Cooldown: 70 / 60 / 50

Aghanim's Scepter can be bought by Lina and will give Laguna Blade even more damage and increase its range.