Herald of agony support gems

[Extinction]

like the title says, im searching for support gems that work with herald of agony. Im a bit confused, since it is a buff aura and a minion in one. Do minion support gems and aura gems work?

[Gus the Crocodile]

Heralds aren't auras, those are two separate things. But yeah, minion gems work, and other things that can support a minion using projectile attacks should work to affect the Crawler (like, say, Faster Attacks, Vicious Projectiles).

I'm surprised to see Increased Area of Effect and Concentrated Effect don't work, given the minion does have an area attack. Ah well.

All mana cost multipliers will increase the amount of mana the skill reserves, which can get pretty large pretty quickly, so think carefully about what you use. Even unsupported the Crawler does quite a lot of damage.