Another common question revolves around the weaponry in BSE. At what levels of ZP do things unlock, etc.
Here's a quick chart indicating the required ZP levels needed to unlock the different stages of your weapon for any of the currently playable races in BSE.
As you can see a Spirit has no combat capability and thus has no weapon stats. The Hollow weapon form doesn't really go beyond the base ZP stage since they generally do not rely on other weaponry. In the future there may be a single release to indicate the use of a Cero. Since that is a pretty basic form of attack for the Hollow race aside from physical attacks.
Your ZP plays a role in determining how well you fight not only against others in PVP but also against the NPC's you'll face. Some people like to overboost their ZP in an aim to get stronger faster, but be aware that you could be setting yourself up for failure given that your HP only raises so much per level. You could end up doing more harm than good to your overall gameplay when you make yourself too strong for a lesser hollow, and not strong enough for the level above it.You should also keep in mind that anytime your race changes due to death in the game, you will need to go to the weapon screen and "GET" your weapon again.. failure to do so will leave you fighting without a weapon.