Do you have any ideas in mind? I'd love to hear them.
Let's see, you have 3 weapons and a mount... how about a tool and a pet?
Nebula Rod
If maximum mana is less than 260, functions only as a normal Rod of Discord, inflicting Chaos State as usual and so on.
If maximum mana is 260 or more, upon teleportation, leaves a pretty, sparkly cloud of nebula energy at the player's previous position, dissipates in 1 second. Costs 20 mana per use, 2 second cooldown during which it can't be used at all, no debuff, no life cost.
0.5% chance to drop from Nebula Floater.
Evolution Cub
Looks like a miniature Evolution Beast but without the big pink braincase or the over-developed upper body, though the forelegs are still longer than the hind legs. Spines on back are tiny and cute. Scampers along like a puppy, destroying grass. Extremely fast, like the monsters. Occasionally spits out a tiny homing nebula sphere, also like the monsters, which glows and lights up the area as it travels to the player, but it dissipates harmlessly in a second or so.
Tooltip:
"Headbutting your shins is a sign of affection. Probably."
1% chance to drop from Evolution Beast.
Edit: whoops, I guess the pet name wouldn't be the pet summoning item's name. How about "Evolving Egg?" I know cubs don't normally hatch from eggs, but hey, it's an otherworldly monster that looks like a cross between a purple bear and a pink shark.