When to buy gems?

Will be hard.
Its your choice if you wanna wait or not.
If you want legenderies you gotta wait, but if you need any sort of power (and you do right now), you can roll some singles and get epics and super epics. They will also help you right now.

Load mortar and stun mortar both cost 100 seconds.

When did nebelronix’s secret skill become amazing?

Nah bro, stun mortar costs 200 seconds.I dont even know if it’s worth using it.It stuns only ONE monster for 150 seconds.I think its better to use Hellblast mortar (250s) and kill the monster insead of stunning it. It’s a powerful skill!

Since nebel can create an infinite stun generator with shocking entrances and deathwarg.

Wait how?

Blood duplicate, swap shocking entrance to the back of the line for the duplicate. Blood duplicate again. Use the original to heal the one that just duplicated. If he dies, then another shocking entrance comes in, if not, then backstab him.

Repeat until stunned to oblivion. Add motor in with the shocking entrances to give bronzeshells to geo if you have him.

So you aint bringing shocking from end?
If you have all 3 shocking ones, you gain maximum of 480 stun, minus all the setup (which bring you to around only 100 stun gain i guess).
Far from oblivion.

No, you have this setup:
Drako
Geomagnus/deathwarg
Nebel
Shocking
Shocking
Motor
Shocking
Nebel dupe

You are bringing the shocking entrance in from the next in line, then sending it to the back to the end and cycling through the reinforcements again.

except u can only backtab 5 times, but I get how it works

Beginners shouldn’t be expected to save in such an early stage, because they need new monsters to carry them. Once you hit 1-3 legends(excluding nox and chrono) you should be able to get by without singles.

When I started, I opened 1 single. Got droneguard. From then on I saved.