While holding this rod, you can use your reaction to absorb a spell that is targeting only you and not with an area of effect. The absorbed spell's effect is cancelled, and the spell's energy -- not the spell itself -- is stored in the rod. The energy has the same level as the spell when it was cast. The rod can absorb and store up to 50 energy charges. Once the rod absorbs 50 levels of energy, it can't absorb more until charges are expended. If you are targeted by a spell that the rod can't store, the rod has no effect on that spell.

When you become attuned to the rod, you know how many levels of energy the rod has absorbed over the course of its existence, and how many levels of spell energy it currently has stored.

If you are a spell-caster holding the rod, you can convert energy stored in it into spell slots to cast spells you have prepared or know. You can create spell slots only of a level equal to or lower than your own spell slots, up to a maximum of 5th level. You use the stored levels in place of your slots, but otherwise cast the spell as normal. For example, you can use 3 levels stored in the rod as a 3rd-level spell slot.

You can spend 10 energy stored in the rod to cause the rod to emit an Ancient Dragon's breath Weapon, using your own spell save DC.

Black :  90-foot line that is 10 feet wide. -- Dex Save or 67 (15d8) Acid damage
Blue :  120-­-foot line that is 10 feet wide. -- Dex Save or 88 (16d10) Lightning damage
Green :  90-­-foot cone. -- Con Save or 77 (22d6) Poison damage
Red :  90-foot cone. -- Dex Save or 91 (26d6) Fire damage 
White :  90-foot cone. -- Con Save 72 (16d8) Cold damage

Brass :  90-foot cone. -- Con Save or fall unconscious for 10 minutes
Bronze :  30-foot cone. -- Str Save or the creature is pushed 60 feet away
Copper :  90-foot cone. -- Con Save or the creature can't use reactions, its speed is halved, and it can't make more than one attack on its turn. In addition, the creature can use either an action or a bonus action on its turn, but not both. These effects last for 1 minute. 
Gold :  90-foot cone. -- Str Save or disadvantage on Strength-based attack rolls, Strength checks, and Strength saving throws for 1 minute
Silver :  90-foot cone. -- Con Save or paralysed for 1 minute

You can use an action to present the rod and command obedience from each creature of your choice that you can see within 120 feet of you. Each target must succeed on a DC 15 Wisdom saving throw or be charmed by you for 8 hours. While charmed in this way, the creature regards you as its trusted leader. If harmed by you or your companions, or commanded to do something contrary to its nature, a target ceases to be charmed in this way. The rod can't be used again until the next dawn.

Notes: Damage, Control, Debuff, Utility, Combat, Warding