You are surrounded by an unholy aura.
This causes monsters to randomly flee from the player in ADOM. Something similar to Fear then for FFH? The disadvantage of this corruption was that it would affect both friendly and hostile NPCs, leading to wild chases to find a useful NPC, and would sometimes make shopkeepers + guards attack you(due to scaring away their customers). Not sure how this would be implemented in FFH.
You rage!
Increased damage, reduced chance to defend against attacks in ADOM. Could be + attack strength, - defense strength. Not hard to implement.
Poison drips from your hands.
Causes the player to poison all enemies they engage in combat with in ADOM. Disadvantage is that all food they eat or potions they drink was poisoned in the same way. In FFH... + poison combat, - healing time?
You have grown thorns.
The extra damage occured only when fighting unarmed. Possibly replaces the metal weapons promotion? Extra damage but makes they unable to wield weapons. Seems like a good tradeoff.
Your close attunement to corrupted astral space allows teleportation.
Not sure how this would be implemented. In ADOM, teleportation could be either uncontrolled(you teleport randomly, if you want to or not, and the game spits you out wherever it wants to) or controlled(you still teleport randomly, but you get to choose were you end up) so this balanced itself.
You have grown a bulging cranium.
Good for casters, bad for warriors in ADOM. Since there is no stats in FFH, maybe increased EXP autogain, but reduced strength? This could even make melee units gain free EXP, just like heroes, albeit very slowly.
You are a living mana battery.
Made players drain wands of all their power, increasing their own magic abilities but making the wands completely useless, of course. No idea how this would be implemented in FFH.
You have grown horns.
Melee damage in exchange for appearance. No appearance in FFH, so no idea how to work this.
Your antennae explore the details of your environment.
Another corruption that makes the player ugly in ADOM, this one reveals information about the player's surroundings to the player, such as dungeon layout. Possibly improve lair results in FFH?
Your skin is covered by tough scales.
Increase in defense, loss in appearance(again), as well as dexterity. Since there are no stats in FFH, this would have to be balanced in some other way.
You have grown a total of 12 eyes.
Increase in perception, loss of appearance(Players tend to get ugly by ADOM's endgame). In FFH, you could extent the sight radius by 1(like Sentry), and balance it with whatever you decide to balance the other appearance-reducing corruptions I already talked about with.
You exhale sulphur.
Players get to spit globs of acid at opponents. Could be a corruption-specific spell.
You look somewhat apish.
Caused players to devolve into apes.
Your corrupted tissue seems to heal much faster.
Wounds healed faster, but caused scars that cost dexterity and appearance.
Your feet have been transformed into hooves.
Explains itself...
You have become extremely thin and nimble.
The only corruption in the game with no downside. Highly sought after, it makes players much more likely to dodge attacks. Not sure how it would be implemented in FFH.
Your muscles have stiffened slowing you down.
Player becomes stronger, but slower. Possibly reducing movement range/withdraw chance in exchange for strength?
You have become very light.
Increase in speed, loss of strength. This pretty much already exists in FFH in the form of the Light promotion.