easy
big kick energy: gun damage +25%, recoil, spread +100%
more than ok boomer: grenade damage +25%, enemies drop grenade ammo that can be active?
galaxy brain: big head mode
slayer: non boss enemies below 15% bars, will explode and drop boosters
lootsplosion: killing an enemies has a 10% chance to trigger a lootsplosion
medium
mob mentality: enemy damage and fire rate +30% near other enemies
freeze tag: enemies drop a cryo nova orb at death
pain tolerance: enemies gain adaptive resistance with 20 stacks
speed demon: after killing, movement speed is increased by 50% for 10 seconds, stacks 3 times
floor is lava: the floor is lava
healy avenger: enemies that die can drop a power up that heals an enemy or drops boosters
chilling them softly: enemies can be cryo immune + nova when killed
high voltage: enemies can be shock immune + nova when killed
totally radical: enemies can be radiation immune + nova when killed
charred mode: enemies can be fire immune + nova when killed
acid reign: enemies can be corrosive immune + nova when killed
hard
chain gang: close enemies are attached by a damaging elemental beam
laser fare: enemies can drop a rotating laser trap when damaged
pool party: enemies drop elemental pools when armor, shield or health is down
ticked off: enemies gain 90% elemental resistance
drone ranger: enemies can spawn with a healing drone
boundary issues: close enemies will attack a damaging beam to you
very hard
holy crit: crit damage +25%, non crit damage -50%
dazed and infused: enemies can be infused to be immune to an element and release novas
rogue life: no more FFYL, all enemies drop full hp charges on death
buddy system: enemies can be supported by an invulnerability drone
post mortem: killing enemies can release death, when death touches you, instant FFYL
not in the face: crit damage is reduced by 75%
that are over 25 and tbh, i hate most of them
immunities, totally killing some builds and weapons, crit camage modification throws off balance, close enemies lasers killing melee builds, insta death might be interesting for hardcore players
so lets try to find a good combination that every build and character could live with
easy: obviously lootsplosion
medium: mob mentality
hard: drone ranger
very hard: buddy system
but still, please make them optional!^^
they are terrible