Insight Giant Thresher Ethereal 12-16 Aura

Level 12-16 Meditation Aura When Equipped
+35% Faster Cast Rate
+200-260% Enhanced Damage (varies)
+9 To Minimum Damage
180-250% Bonus to Attack Rating
Adds 5-30 Fire Damage
+75 Poison Damage Over 5 Seconds
+1-6 To Critical Strike
+5 To All Attributes
+2 To Mana After Each Kill
23% Better Chance of Getting Magic Items

Insight is the rune word 'RalTirTalSol' for polearms or staves in Diablo II: Lord of Destruction or also in missile weapons in Diablo II: Resurrected.

Insight is popular among casters due to the relatively cheap runes necessary for its creation, along with the Meditation aura it provides. Instead of wielding it themselves, most players let their Hirelings carry them.