> For the complete documentation index, see [llms.txt](https://wiki.osro.mr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.osro.mr/beginners-guide/tier-upgrade.md).

# Tier Upgrade

<figure><img src="/files/kNQk92BJlsRriwsPFjpn" alt=""><figcaption><p>Type @npc 48</p></figcaption></figure>

**Tier Upgrade** feature is designed to enhance your gameplay by allowing you to upgrade various equipment types. Click the category to see the full list of requirements: \
:black\_small\_square:[Wings](/beginners-guide/tier-upgrade/wings.md)\
:black\_small\_square:[Accessories](/beginners-guide/tier-upgrade/accessories.md) \
:black\_small\_square:[BTS equipment](/beginners-guide/tier-upgrade/bts-equipment.md) \
Each successful tier upgrade enhances your equipment with better stats or additional effects.

{% hint style="danger" %}
**Each category has different % of success chance**\
:o: **-** Wings: **70%** Chance of Upgrade, If it fails, all items are consumed except **Activity Ticket**\
:o: **-** Accessories: **70%** Chance of Upgrade, If it fails, all items are consumed except **Credit**\
:o: **-** BTS equipment: **60%** Chance of Upgrade, except the main **Upgradeable Item**
{% endhint %}