Thunder Palace

Thunder Palace (神鳴殿, Kaminari Den): Thunder Palace is a Lightning Magic spell which can be utilized with any form of lightning-based magics; and one of the most powerful of its kind—made famous by a certain Wizard Saint-potential magician whom had turned over a new leaf after a humbling defeat by his guildmates.

Techincally, Thunder Palance can be classified as a Combination Magic, due to being Lightning Magic Lacrima laced with Organic Link Magic- though it is never specified as such.

Trivia
When initiating Thunder Palace, the user first creates multiple Lacrima filled with large amounts of Lightning Magic—these can be pre-set, in order to give the user an advantage in battle; or they can be manifested via a copying magic; there are multiple ways to get the Lightning Magic Lacrima out into the battlefield. Once the Lightning Magic Lacrima are set out, the user launches them into the air, causing them to become suspended in the air in a circular formation. When all of the orbs are released at once, through the use of hand gestures, the user can direct powerful lightning bolts to strike their opponents from the sky equivalent to the number of Lightning Magic Lacrima within the sky. The tempest lightning orbs are created around the user's location and covers a full four hundred meters, which drags both the user and their opponent into the vortex where the winds lash them both around violently where the lightning flashing all around streaks closer to whichever target happens to be giving off the most magical energy; which is usually the user's opponent as the technique itself requires almost all of their magical energy just to conjure.

As a result, the target and potentially the user themselves are subject to potentially extreme damage from the lightning spawned. This spell possesses vast destructive power, with the lightning's voltage being high enough to completely pulverize what it strikes, eradicating it from existence; when Thunder Palace connected with the top part of a building, it created a huge, round hole in it, making all the physical matter previously found there disappear completely. While the power of this technique devastates everything in its path, the technique will not rest until it hits its desired target, drawing power from the atmosphere the longer it is out. Thunder Palace is also highly dangerous to nullify, posing a great risk to those who were to try and dispel it: if any Lacrima was to be destroyed by an outside force, the attacker would instantly be electrocuted through Organic Link Magic. The preparations for the technique, combined with the charging time, makes using Thunder Palace while in battle impractical unless the user has a partner who can stall to buy time or enough strength to create the formation while under attack.

Trivia

 * As the image shows, this spell is in canon, but User:Perchan simply decided to expand on it because of how popular Laxus is.