The Wise Old Torrasque is a zerg Torrasque that somehow possesses free will, a name and the ability to lead a zerg group, namely the Swarm of the Torrasque.
By the end of the Brood War, the Wise Old Torrasque had come to lead a group of zerg mercenaries known as the Swarm of the Torrasque. It offered its services to the Terran Dominion to deal with the New Trinidad Pirates.
The Wise Old Torrasque is almost statistically identical to the regular Torrasque, except for the value of attack upgrades, having fewer hit points, and one less base armor.
1999-03-26. StarCraft. Vivendi Games. Mission: Mercenaries (in English). Map Archives: Mercenaries. StarCraft Compendium Map Archives.