With better understanding of VooDoo, we've managed to devise a bit more complex spell. The Spectral Eye is an independent unit, relaying what it sees via telepathy. And it can see quite a lot: NV 23, ThV 70%, SPOT 7. In turn, enemies will have a hard time spotting the Eye (CAMO 20/5). However, the Eye is not a very lasting construct: it will collapse within 6 to 11 turns.
Complex Spell: goes into the THIRD slot of the Gray Spellbook. 3 Freshness to use.