Flob76 said:

Hello

i have a question about an other thing maybe you have the answer what is the difference between the elysean balista and the élysean platform because some player like me paid to upgrade their platform for have balista and for a substantial amount and in the end we saw no difference ... It's only decorative ???

We don't understand

I searched for an answer but for the moment I can't find any information...

Hello! 

Each defensive fortification has its own defensive bonus. If you put a ballista on a platform you will receive bonuses from both the ballista and the platform.