In this video, I show you how to obtain all the Electoons (except the time trial reward) and the Lum Medal for the "Savage Swarms" level of "The Grumbling Grottos".
If you recall, we actually got a sneak peak of the swarm stuff featured here way back in the "Shooting Me Softly" level of "The Desert of Didgeridoos". How's that for foreshadowing?
Not exactly sure why I went back to the left starting from 2:15. There's no need to do so, and you can just proceed right as normal if you wish.
Fun fact: I always thought this level was called "Savage Swarm", but it's actually "Savage Swarms". If you don't pay attention to the loading screen, you might not notice the true name since an insect obscures the last "s" on the world map / level select screen.
In this video, I show you how to obtain the Time Trial Trophy for the "Savage Swarms" level of "The Grumbling Grottos".
The only tip I can give you here is that you should really take advantage of the temporary "invincibility" the mobile light shields give you. If you're quick and smart, you can carve shortcuts through the deadly swarms that are faster than the default route.