The Strange Relic is a Jak and Daxter Callback
Tucked away near the start of the Fortress chapter is the Strange Relic, an egg-shaped treasure covered in odd symbols. Translate the markings and they actually spell out 'Naughty Dog' and 'Madman', and the whole thing is really a sly nod to the Precursor Orbs from the studio's earlier Jak and Daxter games.
