Proficiencies

==Introduction to Weapon Proficiency==
 Weapon proficiencies are passive buffs that stack across all weapons. 
They are very useful and all 4 weapon proficiencies must be maxed by the end of your early game phase.
Weapon 	Buff (MAX)
Greatsword	Atk +48%
Staff 	Crit Dmg +15%
Bow 	Crit Chance +3%
Dagger 	Atk Speed +9%
You level the proficiency of a given weapon by killing monsters using that weapon, regardless of monsters level.
This means that the faster you kill the monsters, the faster the weapon proficiency will level up, which makes your early game phase (where you return every 20 minutes to max out the relics) the perfect time to level up the proficiencies of all 4 weapons along with that. 
 * Please note that using stage "RUSH" will not increase your proficiency experience.
 * Being offline will also not increase your proficiency experience.
==Fastest way to level-up weapon proficiency==
The fastest known way to level-up weapon proficiency:
# Return to lower stages/floors (where you can 1-hit/2-hits mobs)
# Accompanied by strong DPS fairies (i.e. Sinbad, Aqua)
# Do mono-weapon grinding 
# Let the game run for some time, use power-save mode and dim phone screen to save battery (if using smartphone) or just use any kind of emulator for PC/Mac
# Return every 20-30 minutes to lower stages/floors (where you can 1-hit/2-hits mobs)
# Repeat the process for all other weapons
 * Fairy kill counts as equipped-weapon kill.
With this strategy, you should be able to max all 4 weapon proficiencies in a day or less.
Credits:
Edenlight & RyuJin