Rex

"'I suppose I could make the game more interesting?'"Rex is a new NPC added in v1.4 (Decide or Perish). He is unlocked after getting the Light Ending (do not grab the medal, and return to the surface). He unlocks Split Mode, an interesting style to play for more experienced players.

After getting the Light Ending, he will simply appear in the Main Area.

Split Mode
In Split Mode, the player(s) get a crate before every floor, with 8 items in it. Upon taking one of the items, a random item of that category OR a weapon upgrade will be given; however, after 4 of any category are taken, the crate disappears and no more items can be obtained. No two items per crate picked may be of the same category.

Additionally, no White/Blue/Yellow boxes, Scroll/Wand chests and Melee/Ranged upgrades appear, making obtaining other items nearly impossible. No Boss Rewards will appear either, and the generation has changed to disallow changing Scroll Players into Scroll Chests, and Red Boxes into Yellow Boxes.

However, not everything is gone. Scroll Players, Red Boxes, Food, Lecterns, Enchant Plates and Ender Chests still appear and function normally. Shops still appear, and all recipes are valid. Also, monster and boss loot is not changed, but will have little function.

The following categories are available from the crate:

Melee Upgrade: gives a better Melee Weapon, like you'd expect from a melee chest.

Ranged Upgrade: gives a better Ranged Weapon, like you'd expect from a ranged chest.

Random Armor: gives 1 piece of armor (boots, leggings, chestplate, helmet); always Iron.

Random Potion: gives 1 potion (Healing, Regeneration, Health Boost, Absorption).

Random Spell: gives 1 random Spell, out of the normal 8-spell-pool.

Random Wand: gives 1 random Wand, out of the normal 8-wand-pool.

Random Scroll: gives 1 random Scroll, out of the extended 10-scroll-pool.

Random Treasure: gives 1 Treasure Item, out of the Tier 1 Treasure pool (minus the Books and the non-treasure items).

After any player picks any four, the crate will self-destruct.