On Fame War we have the 3 Legendary Pets, those are hard to get Stat Pets and those are also the strongest Pets in game!
We have the Buur which gives PVM Damage, which is a reward for reaching Prestige Level 10.
We have the Crystal Wolf, which drops in the Crystal Meteor Cave (Dungeon at skandria) and increases all Stats.
And then we have the Reaper, it increases your PVP Damage and Drops from Lucifer at Monster Clash.