What do you think of itens like this?
Fetish Spear of the Troll Slayer
Upon an expedition into the Dark Jungles of Kasoth the famed adventurer Darren Mclain recovered this unusual and fearsome longspear. The spear is of unusual design, having been formed from a single flame damaged branch of what may be ironwood and carved with as yet unknown sigils and markings. Its head is formed from the several trolls fangs, melded together by apparent sorcery and decorated with unusual feathers and bits of bone. When first grasped the spear sends an overwhelming sense of rage and sorrow through the wielder, but causes no other ill effects. The spear normally functions as a +1 spear of its type, until the bearer is in the presence of trolls, or their kin. At this time the spear will attempt to force the wielder to engage the trolls in combat, forcing a Will Save DC 18 should the character attempt to resist. The spear, when engaged in battle against trolls becomes a flaming weapon. Additionally, with each troll slain the spear heals 1d8 damage to the wielder, or gains an additional +1 to damage to a maximum of +5. When the threat has ended the spear maintains this bonus for 1 hour per magical bonus over +1.
Item Creation: Unknown. Unique Item.