New memorable randarts

[Estie]

the Elven Cloak of Erennion (+23,+14) [6,+43] <-19, +1>
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A mantle made of curious silken material by the Galadrim that wondrously takes
on the hues and shapes of its surroundings.

Cursed.
-19 strength, intelligence, wisdom, dexterity, constitution, stealth,
infravision, tunneling, speed, attack speed, shooting speed.
-95% to searching.
Provides immunity to fire, cold.
Provides resistance to acid, lightning, poison, light, dark, shards, nexus,
nether, chaos.
Provides protection from fear, blindness, confusion, stunning.
Cannot be harmed by acid, electricity, fire, cold.
Slows your metabolism. Feather Falling. Speeds regeneration. Prevents
paralysis. Sustains your life force. Aggravates creatures nearby.
Radius 1 light.

I am really curious how something like this can get created. Is -19 speed as likely as +19 speed ? Probably not, since +19 speed can only appear on a few randarts with highest power, whereas -19 has no such limitation. This thing is based on Beruthiel. Without the negative mods, it would be in the line of Deathwreaker I guess.