Requires: 4 Socket Polearms/Staves (and Bows/Crossbows as of D2R: 2. Larzuk will give it max sockets which is 5 for cryptic axe. Edit: reread your question, you can make insight in a cryptic axe, but you will have to socket in cube and hope for four sockets. Level 12-17 Meditation Aura When Equipped (varies) Insight isn't crazy dmg it's mostly for that meditation aura. Because it is used primarily in Mercenaries, a popular choice is ethereal Polearm such as a Great Polaxe, Cryptic Axe, Colossus Voulge and Thresher Another good thing about Insight is that it is requires cheap runes to make and the level requirement is also quite low - 27, making it possible even on Normal or early Nightmare. It is widely used in Act 2 Mercenaries on Polearms which provides a great boost to Mana Regeneration for even the high-end builds. Insight is important Rune Word which provides Meditation Aura (mana regen). The naviagation below is specifically designed for you to search per weapon/armor type so you can easily find the best fit for your search

Rune words 1.10 are the most important, well-known and powerful rune words.

Diablo 2 insight scythe