What's a very strong/usefull spell in your magic system that's not overpowered?

By "Spell" I mean any term or form of using magic in your systems.

Provide details about how it works, what it looks like, and its practicality. Provide details about how it works, its appearance, and its practicality. It can be a combat-focused or utility spell, but ideally, include both.

In my elemental magic system there are two useful spells, one for combat and the other for utility:

• Kataklystos:

Kataklystos, in the language of my setting, has a meaning similar to the Greek "Kataklysmós" (flood). It means "The Fall of Judgment" or "Total Washing by Justice."
It belongs to the Judgment Concept (Concept being the equivalent of "Element" in my system), which represents the end, omega, justice, and judgment.

Kataklystos is a spell used exclusively by a generation of gods called Klistics, and the effects and appearance of the spell vary depending on which of them cast it.

When used, a thin beam of light is first launched into the sky from the caster's finger, leaving a large window of opportunity for opponents to attack. After this interval, the same beam of light descends, now wider and faster and with immense force, leaving a dome-shaped explosion. Everything within the blast radius is pulverized, but it is possible to survive. As a trace of the spell, it leaves a large Ω. on the spot it landed.

The spell's variations change depending on who casts it. For example, if the fire god uses it, the dome will be covered in flames and, as a side effect, it will char the impact zone.

• Etherize:

Etherize is a spell of the Cosmic Concept, which represents space and the elements/phenomena within it.

Unlike Kataklystos, Etherize can be used by anyone who knows and controls it.

Etherize is a utility spell that conjures any object from the user's energy and ethereal energy. The created objects decay over time 5 to 10 times faster than natural matter. Depending on the size of the object to be conjured, it costs more or less ethereal energy.

It is commonly used by archers to conjure arrows when they run out of natural ones.