The fourth wave of monsters has arrived!

...

The system prompted to bring Su Bai's attention back.

On the platform, the portals on both the left and right sides started rotating.

The monsters that emerged from the portal on the left were a group of green-skinned monsters wearing gaudy totem masks and grass skirts. They wielded huge bone clubs, howled, and surged out all at once.

The portal on the right revealed a group of giant beetles with hard shells. Each beetle was the size of a car tire, with a smooth and shiny shell and a huge abdominal sac filled with a dark green liquid that looked like venom.

【Primal Fairy: Common, Level 4, HP: 520/520, Special Skill: Primal Call (Primal Fairy's innate skill; each stack of Primal Call increases HP by 20 and physical/magical resistances by 5, with no cap)】

【Crystal Beetle: Common, Level 4, HP: 400/400, Special Skill: Acid Spray (This skill has a range of up to 20 meters and will continuously corrode the base crystal's HP upon hit)】

The attributes of the two monsters appeared before Su Bai's eyes.

There are no elite monsters.

However, both types of monsters have very difficult special skills to deal with.

The former's original summoning state can continuously accumulate attributes; the more attributes it has, the harder it is to deal with.

The magic crystal beetle can also attack from a distance.

It poses an even greater threat.

Fortunately, they don't have too much health.

"There's no need to waste energy unleashing multiple skills if there are no elite monsters."

A thought flashed through my mind.

Solar flares!

Whew!!

A huge, blazing fireball suddenly smashed down on the heads of the group of primordial fairies.

at the same time.

Other defensive towers also launched an attack.

Woohoo!

A gray wind suddenly swept across the battlefield, like fine dust particles, silently enveloping the magic crystal beetles on the right, coating their bodies with a layer of gray.

-50-50-50...

A dense barrage of damage numbers appeared.

Immediately afterwards, an oval mirror shimmering with a soft luster appeared on the road.

A piercing arrow!

Whoosh!

A dazzling golden light suddenly flashed by.

It dealt 147 points of damage to seven or eight magic crystal beetles in a straight line.

Furthermore, after hitting the refracting prism, the golden light bounced back, causing another round of damage to the monsters.

Even without the amplification of the Divine Might Totem, Holy Arrow still managed to deal 254 points of area-of-effect damage.

This demonstrates the amplification effect of the Prism tower on Holy Arrow.

"A single prism can refract an attack once, but what if multiple prisms refract the attack simultaneously?"

A thought suddenly occurred to Su Bai.

But to do this...

It's somewhat difficult.

The Holy Arrow's normal attack disappears after hitting a target and cannot be deflected.

And the piercing arrow attacks in a straight line.

On a straight line, even if there are multiple prisms, it's useless; you'll only benefit from the refraction effect of the first prism that hits you.

Unless, of course, he can use multifaceted prisms to construct a large refraction field in the field.

The piercing arrow is deflected multiple times.

They can even use the refraction effect of prisms to make a beam of light never disappear...

"It's unrealistic to say that it will never disappear, since the angle of incidence of light cannot be the same as the angle of inward reflection of the prism. However, it is possible to extend the duration of light's existence."

"However, this requires a higher grade of refracting prism; a three-sided prism is not enough."

That's what I was thinking.

Su Bai has already begun experimenting.

This wave of monsters is indeed not difficult for him to deal with using his existing defensive system.

Solar flares do not require multiple times the energy expenditure.

The damage was sufficient.

The number of outputs has increased significantly.

With a maximum energy of 50 points, it can unleash five ordinary solar flares, and as it recovers over time, it can add one or two more.

A single attack can eliminate seven or eight monsters.

Combined with Holy Arrow for additional damage and the control effect of Fallen Dream.

Neither of the monsters could get close to the base crystal.

With his attention focused, Su Bai took control of the refraction prism.

He changed the placement of the three prisms one after another, and then used the Holy Arrow's normal attack to test the refraction angle of the beam.

soon.

Let him find a delicate balance.

Whoosh!

An ordinary beam of light hits the first prism and then refracts towards the second prism.

After hitting the second prism, the light arrow did not disappear.

It refracts again.

After traversing nearly 100 meters across the field, it hit the third prism.

It refracts three times.

The arrow of light eventually struck a monster that had just stepped out of the portal.

-140!

The damage did not diminish at all.

"It works!"

Su Bai nodded slightly.

In this way, when releasing a piercing arrow, there is no need to pursue the number of monsters that can be hit by a straight-line attack.

It is refracted by three prisms.

Piercing Arrow can now attack monsters on three paths simultaneously.

When monsters spawn from two or more portals, the damage output efficiency will definitely increase significantly.

Furthermore, with each additional prism, the piercing arrow can be refracted one more time.

A single attack can deal at least three to four times the damage of the previous one.

If combined with a divine totem.

The output is explosive.

They can cause damage comparable to that of a solar flare.

Thinking of this, Su Bai's expression froze for a moment, "...a normal-level defensive tower needs the cooperation of two excellent-level support towers to achieve the output of an excellent-level defensive tower."

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