Just got the Silver Axe to drop as well, also 5% drop rate. Except this time it dropped after 3 battles. Funny how that works, huh?
It’s not like you can’t go back and grab a silver axe whenever you wanted, anyways. The sun axe is the only true missable in the game right now.
I think the Rending Eye, or the one dropped by Fallen Paladins are also missable, as well as the Trilobite staff. Also, I got another Sun Axe in the Cambria Arena.
The Trilobite Staff has a 50% drop rate, it’s extremely hard to miss, but I guess it’s possible.
Also (I haven’t played the Arena much), you probably have to fight Trilobites in the Arena.