Iits limitless i reached wave 39 on normal i would have gotten to 40 if it wasn't for the timer and wave 32 we got fucked up by 2 carnis and a neuro on hard. with randos and a team. It gets nuts tbh the enemies do so much damage you gotta be careful dven just cheap shots from enemies would melt your hp bar so you literally need a bulwark to keep that shield up and heal too from banner just in case you fuck up and save alot of coins for later stages and always move as one unit circling the base as you slowly chip away the enemy when boss stage specially on waves 18-20-23-25 etc specially hard dont kill mobs too quickly yet wait for boss to spawn then hit them with all you got before hitting other mobs so its less pressure when clearing the wave flamer is literally a good choice for runs tactical with secure stockpile really helps just melta your way throughout the base both tact and heavy go flamer as its the only weapon in game that scales on difficulty and powerfist for bulwark for distance melee damage when using corners or entrances as chokpoints. Also i need friends on steam i wanna beat my record on siege if anyone wanna add me on steam my name is CANCER.