[You no longer have any upgrade tools!]
Su Wan pressed the upgrade button, but a prompt popped up. She was stunned. She didn't even know how to react for a moment.
'How did the upgrade Tool suddenly disappear?'
She pressed the option again.
[You no longer have any upgrade tools!]
[You no longer have any upgrade tools!]
Su Wan looked at the prompt dejectedly. The building upgrade stone could no longer be used.
'But how did this happen?'
Su Wan investigated the system panel. She searched through the list of buildings and finally found the answer.
[Used the building upgrade stone to upgrade the Dark Arena.]
Su Wan slowly understood. She looked at Xu Yuan angrily.
"Scammer Xu, what the hell?!"
She felt so angry that she clenched her fist tightly. Xu Yuan wore an innocent and sheepish expression as he looked at her.
"Ahhhhh!" Su Wan was furious.
