4Game

I was curious what could and could not go through Fiend's Gate and tested a few things. I am sure these existed before Underlord had his ult replaced but I haven't seen a post about it before.

• Enemies can go through gate. Saw this on Insania's stream.
• Illusions can't (Manta, CK, Naga, etc.)
• Beastmaster boar can
• Brewlings can't
• Lycan in ult form and his wolves can
• Phoenix casting sunray can
• Rooted enemies cannot. Includes things like phoinex egg and Nyx burrow
• Arc Warden double can
• Broodmother spiderlings can
• Lone druid bear can't
• Meepo clones can
• Chen creeps cannot
• Dark willow in shadow realm can
• Slark in ult can
• Leashes work as expected. Break on other side. Puck dream coil will stun. Bat lasso will just break.
• Warlock golem can
• Visage birds can
• NP Treants can

I am sure there is more to test but this is all I could think of initially. Chen, Lone Druid and Brewlings seem like they should be able to go through.