Drilling Shot

Terrain Interaction Spells

Avoiding Arc

Makes a projectile shy away from obstacles

Drilling Shot

Gives a projectile the power to go through the ground

Firecrackers

Makes a projectile release firecrackers when it disappears

Floating Arc

Makes a projectile float above the ground

Matter Eater

Makes a projectile eat the environment as it flies

Explosive Projectile

Makes a projectile more destructive to the environment

Spell modifiers that change how projectiles interact with solid terrain.

Drilling Shot is a spell modifier that causes a projectile to not be stopped by terrain, instead slowly drilling through it.

Tips

This is extremely costly to use, with both high mana drain, cast delay and recharge time penalties which means that no matter where you put it in the spell order it will always slow down the wand.
Synergizes well with Homing, making projectiles chase enemies no matter where they are.
Speed Up or Accelerating Shot will mitigate the slow digging speed.
It is a misconception that Drilling Shot is required to make a projectile expire only when its lifetime runs out, alongside Piercing Shot. This is not the case, as Piercing Shot also prevents projectiles from expiring upon colliding with terrain. However, some types of trigger spells may be deactivated on collision with terrain (or enemies that bleed Bone Dust) without Drilling Shot.
You may have to include an Increase Duration modifier to make sure certain shorter-lived spells actually reach their target.

Apr 8 2024: Changed the spawn probabilities on tiers 2, 3, and 5 from 0.6 to 0.2, 0.3, and 0.4 respectively.
Dec 19 2019: Added to the game.