Here is an updated table:
Levels 1-4
Emerald Eloquence is a magical wand that can be used as a dagger, and unlocks the spell fog cloud once per rest.
Levels 5-10
Emerald Eloquence is a +1 magical wand that grants fog cloud once per rest. In addition, it has 5 charges, regaining 1d4 per dawn, which once expended, can be used as metamagic points to cast empowered spell
Levels 11-16
Emerald Eloquence is a magical, +2 magical wand that grants fog cloud once per rest. In addition, it has 10 charges, regaining 2d4 each dawn. You may spend 1 charge to use as a metamagic point to cast empowered spell or careful spell
Levels 17-20
Emerald Eloquence is a magical, +3 wand that grants fog cloud once per rest. In addition, it has 20 charges, regaining 4d4 each dawn. You may spend charges to use as metamagic points for empowered spell, careful spell, or twinned spell. Finally, if used as part of a ritual, it will decrease the cost of a ritual by 1/2