I just reached 70 def and attack, and I was wondering if there was a place I could train with full Guthans where the NPCs will never lose their aggressiveness. Thanks

Only place would be bandits, wear a piece of god clothing/book/article...etc. But i don't recomend this, i tried it with a void spinner and the only thing that saved me was a ring of life and i didn't even get 15 minutes worth of training. I could've gotten twice the exp if i'd actually paid attention and thats saying a lot with purely guthans. With a whip, i probably could've gotten 3x the exp i got off watching youtube with guthans. Also, afking is against the rules, you might as well focus. Unless you have a bunyip (68 summoning), its pointless.

if you look at another screen its not afking

Guthans really is only useful as a alternative to food and not a training weapon (the spear).

 

If your looking for the laziest training spot the bandits are great, but the exp is less then that of non-afk training. This is due to the poor damage you do with guthans spear compared to a whip, god sword or d scimmy.

 

 

 

Best uses for guthans is slayer of course.

 

Other good monsters are Fire giants, good exp and the drops pay for the repairs.

 

Cave horrors, best using a combination of Karils and Guthans (switch to Guthans just before you hit half your hp), the drops being the main reason to train on them.

 

...

 

Those are the only 3 I used to use Guthans for (that was about 6 months ago so there may be more options now).

Yeah, not planning on afk, but also not planning on paying attention to every hit :)