Warrior General Games

I mix in stamina in my multi-training. Is there any guide to what stamina should be per level? Is equal or slightly above your level good enough? My DE is level 15 with 15 stamina.

There is no actual "must-have" threshold for stamina per level. In fact, most players don't even spend any SP in it before a very very high level. Most players will get between 50 and 60ish stamina at the end of the player's career, but you should never focus on it early. Not even if you're a STOP or returner.

I get stamina into either my 1st or 2nd wave of multi trains... but as far as a proper stamina value per level... no clue. Just focus on having stamina at the softcap by level 62ish and you're fine.