this item would be an active that on use grants additional ability range. in practice it would be very similar to infuser. to tune the ability i think you could play around with the duration of the effect, amount of range provided, only allow it to effect one ability (imbued), only effects next ability. I envision this item to be like popeye's canned spinach, your character bites the cork and it makes an audible pop (to warn the enemies) and downs the whole potion.