Feedback of any kind is always appreciated, and since you presented your observations in a educated manner, I'm more than happy to discuss them. I'll try to give my reasoning for some decisions, though the actual quantitative data for my reasons may not add up in practice, only in theory.
Lich armor - Definitely for balance reason. Ichor is a pretty powerful debuff and being able to quickly apply it to everything you hit with a multi penetrating attack at
all times would make many things trivial in singleplayer but also multiplayer. I don't see much of an issue with melee being able to do it because at later points in the game, the Melee class really becomes a tanking/supporting class.
Shade Master - The set bonus exists to allow other modded throwing items the ability to grant the teleport/damage buff, but that being said I think I could make it something more interesting. As for the teleport itself, it's an older effect and I think I can do it better justice in terms of fluidity.
White Dwarf - The White Dwarf Armor is in essence a boss killing armor. At that point in the game, the white flare procs so many times that what reads as a single 0.5% of the bosses health quickly starts to add up to huge numbers when it can proc multiple times a second. Remember its not
.05% its 0.5%, so despite it having worse base stats, the set bonus is where its power comes from. Which is the case for a couple more Thorium armors.
Plague Doctor - Just sounds like I need to make them stronger/easier to get/check the balance of other similar items.
Life Leech - It's sort of intended, yes
Black Dagger - The idea is if you want to quickly give yourself max stacks of darkness within you right click a couple times giving you +3 per attack to the buff as opposed to +1.
Misc. throwing weapons - Just about all of those have received balance changes in the net update, so don't fear.
Plague Lord - It's donator item. What they asked for is what I gave them, so I cant change much about it.
Depth Crown - Yep, I changed it next update to refresh far quicker
Summons - I'll take a look at it
Theseus' Thread - Been fixed next update
Time Warp - Been fixed next update
Lodestone and Valadium - An older idea, but primarily just for variation.