Turnoroth's Lightning Spike

The caster channels electrifying energy through the electrum rod to form a spike made of pure lightning. The target of the spell must make a Dexterity saving throw or take 3d10 lightning damage and have their speed reduced to 0 for as long as they remain lanced. The target takes no damage upon a successful save. At the end of their turns, trapped targets may make a strength check to remove the spike against the caster's spell save DC.

When cast at higher levels, the damage is increased by 1d10 per spell level above 3rd.