As soon as I got cavalry angels with the frost lance I ended up immediately going to fight greg..... Even when I afk kill him due to perma freeze it still takes forever ... the dude has like 1m+ hp x-x
@Name the second challenge requires you to have meteor since without seeding you cant reach the original crystal even at level 6. So just focus on making your plant strong (and ofc the stronger your meteor the better) and persevere until you manage to break the enemy crystal. Ps: It has a small regen on it so I'd get level 2 or more on the power meter if you want to end it faster.
I love how everyone dislikes a comment supporting this game simply because it doesn't suit their visual desires or grant immediate satisfaction. It's meant to be a long term game, get over it -.-