Once you reach skill 16, you will gain the Draw Charge and Fill Charge special actions upon your next level up. Draw Charge destroys rods for charges, while Fill Charge uses drawn charges to recharge spellbooks, rods, and blankets.
Note: Elona+ has increased the skill requirement for these actions to level 20.
If you want to train this skill somewhat faster than normal, it's gonna take some fetching, but it'll be worth it. Gather up a bunch of materials, looking for tree trunk looking sample spots for the materials. Use carpentry and make some low level rods, like cure light. Then spam use of these rods for training. Or, just go to puppy cave and grind out some random levels until you get a nice stack of rods, that works too.
Or if you can afford the money, goods stores sell a bunch of random rods, so you can buy those. The fastest and relatively safe way to use up offensive rod charges is by entering a Panic or Challenge quest (that has sturdy monsters with weak attacks) and spamming rods.
If you're playing Elona+, training Magic Device has become much easier. In addition to zapping rods, you can also gain experience by quaffing potions. You cannot train Magic Device through easily obtainable items like snow or dyes.
Once the player acquires the dupli-cane special action at alchemy level 30, Magic Device can be trained freely by activating the dupli status, then spamming weak ball rods such as a rod of bubble ball in order to train the Magic Device skill without drawing any charges or needing an enemy target.
In Omake Overhaul magic device now has a new use. The higher your level in magic device the more likely your weapon will activate Invokes###. This doesn't increase invokes that already happen very often and caps at a 50% change of activating.
#magic dwill increase Magic Device by 1 level and train its potential.
|Strength||Tactics · Two Hand · Weight Lifting · Long Sword · Axe · Martial Arts · Scythe|
|Constitution||Healing · Mining · Shield · Heavy Armor · Medium Armor · Carpentry · Blunt · Polearm · Stave|
|Dexterity||Lock Picking · Dual Wield · Light Armor · Evasion · Tailoring · Pickpocket · Jeweler · Disarm Trap · Short Sword · Bow · Crossbow · Throwing|
|Perception||Stealth · Sense Quality · Detection · Fishing · Eye of Mind · Greater Evasion · Marksman · Firearm · Analysis (Elona+)|
|Learning||Literacy · Memorization · Alchemy · Anatomy · Gardening · Cooking · Gene Engineer|
|Will||Magic Capacity · Faith · Traveling · Riding · Eye of Mind (Elona+)|
|Magic||Meditation · Casting · Magic Device · Control Magic|
|Charisma||Negotiation · Investing · Performer|
|Speed||Swimming · Traveling (Elona+)|