So is there another way to change diplomacy from Enemy to Ally in Single Player?
I think I’ve figured it out.
I found this applies to AoE:DE in single player,
If another AI player is Neutral (I had never attacked them): 2600 tribute of any resource or combination of (one or more), the AI changes diplomacy to Ally for me, along with the message “your empire is worthy of my allegiance” and I get notification that the diplomacy of that player has changed to Ally.
If the tribute is below 2600, I receive the following message
“we are not interested in any allegiance.”
If another AI player is Enemy: 7500 tribute of any resource (one or more), the AI changes diplomacy to Ally for me. I find that sometimes the message varies, it will usually reply “your empire is worthy of my allegiance” but sometimes it still replies " your petty offerings will not sway my determination to crush your empire" but changes to ally anyway giving me the change to Ally notification. I find I get the first message if the tribute is 8000+. On the odd occasion, it did seem to also work with 7200.
If the tribute is below 7500, it will just reply " your petty offerings will not sway my determination to crush your empire"
I also found, once an AI player changes diplomacy to enemy twice, no amount of resources will make them change to ally again, and any tribute will just return the latter message.
The amounts are also cumulative - if I tribute multiple times at different times in smaller amounts, it will also work (e.g. 1000 + 1000 + 600)
I tried this in a death match, tiny map, 8 players (7 AI) , I allied all the AI, then just watched them all battle it out between each other!
I tried it for 15 minutes, with an allied victory, so it seems to work for at least that long, I haven’t tried it for any longer to see if it changes back randomly.
I tried to replicate it in the original AoE, but doesn’t work, only seems to be a thing added to AoE:DE (I didn’t try it in the original ROR)