Spell modifiers that adjust the lifetime of the affected projectiles.
A spell modifier that causes a projectile to have a shorter period to live before timing out and dissipating. This can cause a projectile to not being able to reach the target you're aiming at, but reduces cast delay to compensate which causes the next spell to fire faster.
Reduced projectile lifetime is often a detriment, so you'll essentially be buying reduced cast delay for 10 mana and less range.
As cast times are ignored when spells are fired by a Trigger, using it as part of a delivered spell package in this way is not a good idea if rapid fire is what you're after.
Can be used to make timed spells like Death Cross or Bomb explode faster. Useful when delivering them with a Trigger spell.