Here we go again, level 20 xp required: 2,015,539,200 vs. level 19 xp required: 58,113,073,350. This just seems odd, both half-orc necromancer second one with learning > 2000.
Well once you have like 10 grade 7 organe-lime in traps and 50k max mana nothing will happen until at least wave 100... not that there is much point in building that many in the first place though.