I was surprised only by guards like 500+ dendroids or ruhs for the library, relic, and another artifact... and I even killed the dendroids for exp and for the +4 all shield, which came in handy.
P.S. finished at 145 with 160%, the AI there is a total noob; it would be more interesting to play this map with people, but early skirmishes are not good and everything will end without a mega clear... but I liked the map. After all, killing nearly 20 6-lvl monsters isn't that simple, especially when your own respawn is poor. Screenshots attached)