quadruple consoles (because 4 is needed to start a game sadly) stun boosting on artifact assault for 24700-24900 xp every 7 1/2 mins with no interruptions is the absolute fastest method. make sure you don't go above 24999 xp, otherwise the xp time you overboosted for goes to waste sadly. i was multitasking 3 controllers (leaving my 4th controller idle) having the opposite team revive my pussycats over & over after every stun as you see on my vod while the cycle repeats. the only catch of this method is randoms ruining it, but luckily, they barely join to interfere as time went on.