What he said seems pretty relevant to me, considering they're all ways to obtain charms. And the topic creator doesn't seem to be too opposed to grinding, since he inquired about Waterfiends. But what do I know. I would definately train your combat stats a little bit more if you plan to attempt Waterfiends without a bunyip. And yeah, while they're second best to Rock Lobsters, they're still pretty pricy because you buy prayer potions. But...yeah. Regardless, your first priority should be to train a bit, if it's crimsons you desire. (And tbh if you're just going to train anyway, you might as well do slayer and kill two birds with one stone.) prayer pots dont even cost much and you can actually profit at waterfiends with all the great stackable drops