Board Thread:Game Discussion/@comment-12919914-20130912020226/@comment-11948001-20130912152242

RickyTes wrote: Glass cannons = Strong Attack & Weak HP/Defense

No energon for the special evolve campaigns. Those are collected from the Raidboss events if you seeded a lot of low level bosses (can't remember if Ironhide gave you any). If you run out of energon for this event, you pretty much are farming battle cubes.

Happened to me on the Ultra Magnus Evolve event, but had quite a good amount of battle cubes for the previous Optimus Event. As Artist & RickyTees says, Glass cannons refers to something that does a load of damage but is really fragile (the glass sword of Ultima days - did insane damage but broke as soon as you used it).

Out of the two (current) episode types, the Campaign episodes (such as this one) is a good way of farming Battle Cubes Recharges, as you get one Battle Cube for every boss/wave you kill you can convert your hourly cubes you gain into recharges. The Raid Boss episodes (such as the last one) is a reasonable way of farming Energon recharges as the lowest two bosses give you an Engeron Cube as the starter (regardless of seeding).

You will be getting Energon Recharges as point rewards, however you are right, you really need a stack of them (min 200) to stand a chance of getting anywhere in the episode - more if you're looking for a Tiered reward.