when do upgrade stone fail and mess up with your equipment in mabinogi?

In Mabinogi, upgrade stones usually don’t fail until the later special- upgrade steps , and the dangerous part is when a failure can downgrade or destroy the weapon rather than just stop the upgrade. The general pattern is that early special upgrades are safer, while the last step is the one players worry about most.

Quick Scoop

• Special upgrades require a weapon to be fully upgraded first, plus a gem upgrade.

• The first special upgrade is guaranteed, but later attempts use success rates.

• If a special upgrade fails, it can drop to a lower step; at the highest step, failure can destroy the weapon.

• Protective upgrade stones prevent those failure penalties, but they do not make the upgrade itself more likely to succeed.

What “mess up” means

The risky part is not every upgrade stone in every situation, but the special upgrade chain after the weapon is already prepared. A failure can mean losing progress, and on the highest attempt it can mean losing the item entirely.

Practical rule

A simple way to think about it is this:

• Early steps = usually safe or low-risk.

• Middle steps = can fail and knock you back.

• Final step = can fail and destroy the weapon unless protected.

Extra note

Some event stones have wording like “won’t fail until +5,” which players have interpreted as meaning they are safe up to step 5, but the next step can still be dangerous.