Hobbler's Challenge - core game material?

[Tinker]

[Darvin]

Just tested Half-Dragon knockback interactions with specialist. I knocked the boss into another monster, another monster into the boss, and the boss into a wall, then proceeded to kill him. I got credit for specialist. Knockback damage (at least from the half-dragon) does not preclude you from specialist. This means the only way to fail specialist with the half-dragon is with PISORF, which is pretty niche.

[Lujo]

It's most likely that knockback is always typeless, because it's a separate instance of damage from the main attack. So there's no direct and indireck knockback, it's just that Pissorf does physical damage to the first target if there are two targets, and the attacks do whatever to the first guy and the knockback part is always typeless.

So, Half Dragon can't fail Specialist withut Pissorff (and possibly only pissorff into another monster).

As far as the challenge goes, you need to scum for the Guitar for Purist, and You can't fail Specialist with a Warmonger Dragon (yeah, rather niche).