When I wear a Draconic Evolution armor the event horizon doesn't even hurt me.
Could you increase it's damage to ensure that anything killable WILL die when they are at the wrong place at the wrong time?

Yes the damage is enabled and it was a normal gate, not a pegasus gate.
All damage is taken by my armor and more testing showd that a protection IV enchanted endstell armor from EnderIO can save your life too.

Actually this is a valid bug. The intended result is suppose to be death.

internal note: SGBaseTE: final static double transientDamageRate = 50;

Just for your information, a draconic armor can have a few thousands of shield.
Also as far as I can see the damage can be lowered by armor and protection enchantment. Some mods add an armor which can lower the damage by 100%
I hope the vortex will also be deadly in such armors ^^

Also whatever you do I hope you will also fix this in a 1.12.2 release since thats the current version where me and my friends are playing :)

I'm going to make the transientDamageRate configurable in the master config file.

This is fixed in build 2.0.3

What type of gate did you build and what do you have the transient damage in the config set to?