The Confusion Surrounding F4 Rares

The Salvaje has now been moved to rare, which means that it can go to +15, but this also means that Salvaje owners who have had theirs at +10, keep that +10 without having to use rare crystals to reach it instead.
Rares on F4 can now go to 504 once they are fully upgraded, this includes Salvaje, Eterna, and Emerald Strike.
On older servers, the game hasn't updated, so when switching from new to old servers, the damage of upgraded rares will fluctuate. (Example being that on an old server, my +4 Eterna will do 348 damage, but on servers in the new version, it will do 365.)