EXPLOSION!

Description
Upon casting, charge up a massive explosion over a period of 3 seconds that has a radius of 4 tiles onto the player's aim marker. The explosion deals 500 damage to all targets hit before causing the player character to rest for another 4 seconds. During the charge-up phase and the resting phase, the player may not move or cast another spell in between. during the charge-up phase may be removed by the upgrade. The resting phase, however, cannot be affected in any way. Consumed on use.

Strategy and Synergy
Explosion is individually powerful against large groups of enemies, and offers very high coverage of the field, however it demands a great deal of charge time and rest time wherein you are entirely vulnerable. Many decks are better off simply using 5 mana, and 7 seconds, doing something else - especially against bosses, where health pools far outstrip EXPLOSIONS!'s damage potential. Due to being consumed, it's impossible to rely on casting it multiple times.

Synergizes well with Blood Shield, Corset, and other high Shield providing effects, as you will spend a great deal of time unable to move and will likely be hit repeatedly during the charge or rest period.

Benefits greatly from O (Overload), since the charge and rest time remains the same and the typical downside of O (Overload), consume, is already a part of the card anyway.

Pairs excellently with and, as they can take advantage of the high power of EXPLOSION! without needing to incur the charge or rest time. Switchbait and Sustain also do not get consumed on use, meaning you can craft a thin deck that makes consistent and repeated use of EXPLOSION!'s high damage.

Synergizes well with Soul Link in situations with many objects that can be hit, allowing you to duplicate your area of effect damage onto a single target.

Trivia
This spell is a reference to Megumin, a character from the Japanese light novel series KonoSuba: God's Blessing on this Wonderful World!.