A spear that reflects the life of it’s owner trough small Haiku like poems. As the soldier lives his life the spear casts a shadow of his great exploits. Small runes are carefully etched in the ash shaft after a great battle or another important event in the warriors life.
Real World: some Indians in the Amazon treat their eyes with a traditional potion applied with palm leaves. Brutally painful, the drug alters vision, giving the jungle's dense green walls greater texture and dimension. You could adapt this to desert or swamps, or other hard to navigate regions.