Giants and Titans are level 7 creatures of Tower town. They are recruited from the Cloud Temple. Both creatures are immune to mind spells. Titans hate Black Dragons, which cases them to "burn with anger" and cause +50% more damage when attacking Black Dragons. Additionally, they are the only 7th level creature with ranged attack, and they suffer no melee penalty.
The ability to "burn with anger" and do extra damage to black dragons is likely a reference to 3DO's previous title Heroes of Might and Magic II. In that game, the Wizard and Warlock were widely considered to be the strongest heroes and there was some debate among players as to the single strongest 6th level creature.