There is currently an issue with Hytale's Update 3 where the server will fail to load with the mod installed. The solution to this is just checking the "skip mod validation" in the world settings. I'm working on fixing this properly though. 

Video Showcase:

This is a standalone version of the HyRise NPCs mod, that adds just the Ironmouse NPC that the player can trade with. You can craft a spawn egg at the HyRise workbench, which can be crafted from the regular workbench.

 Mouse is my first attempt at creating more of a "trader" NPC than just a merchant, aiming for a more Escape from Tarkov/S.T.A.L.K.E.R kind of bartering, rather than just pure "buy this with life essence." Eventually all of the NPCs will follow this model, but Mouse is the most useful right now.

Mouse primarily deals in pink items, being the most (only?) reliable source of both pinkberries and popberry bombs. She will buy pink petals and Mouseiron for life essence.

Mouseiron Armor:

Stronger than iron and lighter than Thorium, Mouseiron alloy can be used to make the Mouseiron Armor set.

Mouseiron Weapons:

Mouseiron can also be used to craft the Mouser C96 pistol, a small firearm with low damage and a high rate of fire. At the moment it only shoots crude arrows. Custom bullets will be added in future updates.

Items:

Mouseiron is a new metal type that comes along with the Mouse NPC:

Mouseiron Ore can be crafted with 2 iron ingots and 5 pink petals in the SCP-x009-1 Workbench, which can then be smelted down in a furnace into Mouseiron.

Check out the full mod!

Like the rest of HyRise, this mod is still under development, and I plan on building a full on progression system. Most of the actual barters right now are placeholders until I have a more fleshed out collection of custom items.