Tip#1: Pwnin a Champ

Drulls can be pretty OP. I personally took the Gorgo, and 1vs1 the Gorgo could easily take the Drull at younger levels (1-5). Now though, not even 2 healers+1 lvl6 Gorgo can take a lvl6 Drull. Anyway, it's still not that hard if you think about it.

Champions, especially Drulls, do a large amount of damage every single attack - this is why Drulls have the advantage in a 1vs1 at lvl 6 vs a Gorgo. That being said, champs still have a limited attack speed (ex. 1 attack per second, 8000 damage per attack = 8000 dps but only on a single target)

The best approach to taking out any champ is simply using numbers. I personally prefer using about 10-20 Banditos (mine are fairly high level now, but just use more if you need to).