Just went through my third run of the Dark Mech Dragon dungeon - no boss drops, no succubii.
Mixed it up a bit and decided to give crappy Thor some play time. I ran -
Thor the God of Lightning - lvl. 10 (←EXP hog)
Genie - lvl 30
Keeper of Light
Holy Dragon - lvl 30
Pterados - lv 22
Friend - Amaterasu Okami
Thor gives 2X ATK and RCV for all light creatures, so it wasn't too hard to keep going. I have a lot of redundancy in my team in case I run out of hearts to match or some other act of god happens.
The scariest part of the whole run is probably the first turn. Worst case scenario is there are no light gems and multiple monsters are on the same timer.
Otherwise, it's just tank and spank. Burn down enemies that share timers first. Boss fights usually require one heart match every other turn. If you run out of hearts you can pop and half-damage or invuln shield or even just go Amaterasu for a quick heal. Holy Dragon and Pterados were good for trash mobs and burning down Succubus and Lilith. Even Thor got to bust out light enhance a few times.
It was an overall faster run, but lack of orb changers hampers the fun factor.
How do you guys keep track off when to use the eggs? How did you guys make speculation on these God festivals thing earlier?
You mean the crystals, right? There's always some sort of special going on that increases drops of a particular element. If you're at a relatively good spot box space-wise, just hold onto your gems until you get a special that includes a unit you want. AND CHECK OUT CPP's post below about GodFestivals.
Either way, the chances of you pulling something you really want are pretty slim. You're probably going to want to keep a few crystals on hand just in case you get a rare drop and need to continue (if you're not planning on spending any money.)