Breaking Into the Vault!

"Someone broke into the Secret Vault and is releasing previous Limited-Time Units! They left us a note, telling us that over the course of 10 days, a promo unit will be liberated from captivity! To celebrate their release, all units are being offered at 25% off their original price!"

- Battle Nations Update by KoolRanch

Overview
The Breaking Into the Vault! event (or 10 Days, 10 Units event) was a promotional event released in the 4.8 Patch.

First Event
Beginning at 11am pst June 19th - June 29th, a past promotional unit was announced (one per day). In celebration of each unit, they were available for 25% less than their original price. This special release was available to all players level 20 and above.

The promotional units on sale were:

Second Event
October 22nd - November 1st.