Hint 1 Start with the archer minons on first wave collect mana on first wave to build the auras and then build everything before second wave
Hint 2 sometimes a orge might slip passed it never managed to hit my crystal but keep your eyes out
upgrade order
buff beams
auras
towers
minons
this is just to farm the accessories
i may have low balled the stats on the summoner not sure since mine that i did this with had 2k in all but i think it's more than doable with 1.5k in all the summoners stats