Checked July 15, 2026

Build a base RNG Items & Defenses

Use this page to separate visible or repeatedly reported defense families from names that still need confirmation. No rarity, odds, damage, range, or trading values are guessed.

Quick answer

Choose by the gap in your base, not an unknown rarity

Build a base RNG is about rolling defenses and placing them against waves. Until a complete current catalog exists, the safest comparison is whether a defense helps the front, middle, cleanup, or boss-test job.

Official Roblox media shows multiple visual defense forms across early and later waves. Recent gameplay results add names such as Mortar, Crossbow, Cannon, Sword, Golden Mortar, and Wooden Tesla. Those public signals are useful for navigation, but they do not establish exact stats or a full item table.

Documented families

Defense names with useful public context

These rows explain what is actually visible or reported and keep every missing fact explicit.

Visible early-wave family

Crossbow-style defense

Community-supported

Planning use: Possible early-wave coverage

What is known: A crossbow-like defense appears on the Wave 1 side of official Roblox media; a community result also uses the Crossbow name.

Still unknown: Official name, stats, rarity, range, and replacement timing.

Community-named defense

Mortar

Community-supported

Planning use: Placement and layout discussions

What is known: Recent layout-guide wording explicitly mentions mortars and traps.

Still unknown: Exact item identity, damage, area, range, rarity, and optimal placement.

Reported starter/defense name

Cannon

Unconfirmed details

Planning use: A broad heavy-looking role to test

What is known: The name appears in community gameplay text and cannon-like visuals are plausible in official media.

Still unknown: Official label, behavior, stats, rarity, and acquisition.

Reported defense name

Sword

Unconfirmed details

Planning use: Possible close-range visual role

What is known: The name appears in community gameplay text.

Still unknown: Whether it is a placed defense, exact role, stats, rarity, and range.

Needs confirmation

Golden Mortar and Wooden Tesla

Both names appear in one community gameplay result. Neither has enough independent detail for a dedicated item page or a power rank.

Golden Mortar

Reported as a rare roll, but exact spelling, rarity, odds, stats, role, and availability remain unconfirmed. Numeric odds from a single result are not repeated here.

Wooden Tesla

Reported by the same gameplay result. No second current source establishes how it works or whether that name is used by the game UI.

FAQ

Item and defense questions

What items are confirmed in Build a base RNG?

The game officially confirms that players roll, build, and defend with varied defenses. Public gameplay uses names such as Mortar, Cannon, Crossbow, Sword, Golden Mortar, and Wooden Tesla, but a complete creator-owned catalog is not available.

Is Golden Mortar the best item?

There is not enough evidence to rank it. One community gameplay result names Golden Mortar, but its stats, rarity, odds, role, and current availability are not independently confirmed.

What does Wooden Tesla do?

Its exact role is unknown. The name appears in one gameplay result, so this site keeps it in the needs-check section instead of inventing an effect.

How should I choose which defense to keep?

Test whether the defense helps cover the front, middle, or cleanup layer. Change one placement or role at a time and compare the same wave before rolling it away.

Use the layout guide Compare defense roles Relics and crafting See research references