Pinpoint of Light

Pinpoint of Light is a spell that fires a thin white laser, leaving a small white speck at the point of impact which explodes after a short while. A weaker version of this spell is used as the retaliation attack of Hohtava hyypiö.

The projectile will pierce through enemies and will be able to hit them multiple times (tickrate = 1 or 60 times per sec). It also has friendly-fire enabled (as if modified by Piercing Shot).

Tips

Like Piercing Shot, it works well with Homing. This is because of the particle tracks enemies, dealing projectile damage constantly and explodes on their location when the lifetime expires. Explosion protection is recommended.
Works well with Heavy Shot, which both increases damage and also slows the beam down, increasing the time it spends inside an enemy doing damage.
Use with a single Explosive Projectile modifier for a large explosion damage boost due to the increase in explosion radius (see here for explanation).
This spell's built-in piercing and relatively long lifetime make it ideal for use with Pollen to produce a looping effect, resulting in many copies of a trigger payload for the mana cost of a single cast. This is similar to the effect of Downwards Larpa or Copy Trail, but allows you to copy both a projectile and any applied modifiers.