The build you offered looks swell, but sadly at level 18 I don't have access to the toxic grenade, let alone 10 ranks of it. I'll keep in mind the skill set however, for when I finally have 25k available to buy retrainers I probably will.
Great,glad it appeals to you

I tend to use Toxics as the main ones,and Explosives only in close encounters.A Multishot volley of each tends to suffice for Stonehenge,even more so with some shield penetration.
A Bracelet of Brutality's 35% and 7/10 in Flashcrasher,or a maxed Flashcrasher should provide 100% penetration for all grenades,which is plain amazing for Harrow Deep farming.The thing is,either 7/10 or 10/10 seem to require too many points to be an easy choice.
And God forbid Hanbit do any programming, why, that would carry the redolent odor of effort and we surely can't have that, now can we?
Absolutely not!Such hideous practices only lead to more effort,and such a vicious circle must be avoided at all costs.
Since it's easier to skip the effort and still get paid...
I noticed on this one and your other posts the Weapon Master only gets 2 points. There is no
difference adding more points?
Well there is,each point adds 20% cdb and if we're going to max it,that's 100% more than 2/7.The thing is,it's weighed against other core skills,and in this build's case even more so,since grenades don't crit.
If one can afford it,it's surely a fine investment when all else is taken care of

For instance,I'd argue that it's among the best skills to get on a main weapon if feeds allow it,since it doesn't take away any core skills in case of a weapon swap.