Heretic gameplay mod by Nixos

e1m2: Youtube.com e2m9: Youtu.be e5m1: Youtube.com

Nixos gameplay changes to heretic:

All: damage dealt and received is amplified by 50%

Hp: there is a new ruby jar giving a total of 50hp, 5 hp per second for 10 seconds. Also the mystic urn auto activates when corvus is on the brink of death

Ar: added a doom's berserk like effect, using the dragon bracers. Also there is a new emerald bottle that works like hexen's cleric fletchette (poison cloud, harmful to everyone)
all artifacts have their effect lasting 30s, and monsters now drops them. the exception being strength, fly and torch effects lasting for the whole level
morph ovum can now affect iron lich and maulotaur
shadowsphere now also makes the user immune to lava and slime, poisoncloud (emerald bottle/saberclaw death) and steel (mace) but weak to ethereal (crossbow/undead warrior axes)

Ac: silver shield now absorbs 50% and gives 50 armor, enchanted shields absorbs 50% and gives 100 armor (you can pick a shield item, and it will add its value to your current armor, up to max 100 armor)

Am:
every ammo exists in 2 forms (minor and maior), maior gives 5 times minor, max ammo is 25 times minor, max ammo while having a bag of holding is 50 times minor
goldwand: 004 020 0100 0200
crossbow: 004 020 0100 0200
blaster: 004 020 0100 0200
phoenixRod: 004 020 0100 0200
skullrod: 004 020 0100 0200
lightbringer: 004 020 0100 0200
mace: 004 020 0100 0200
bookofshadows: 004 020 0100 0200
lightning spell: 004 020 0100 0100 (you start the game with 100 ammo, this kind of ammo doesn't drop but is replenished by 4 unit each tick while wielding a powered staff)

Wp:
1) staff/gauntlets (fist/chainsaw) in all cases melee range is: default melee range * 1.5, (powered gauntlets steals life, powered staff generates ammo for weapon in slot 0); staff doesn't have any effect on ghosts.
2) goldwand (pistol) base weapon behaves like vanilla (holding fire makes it lose precision), while in powered state it shoots 7 projectiles in a 90 degree viewing arc
3) crossbow (shotgun) equipped with ethereal morphic arrows, it shoots throwing axes, the powered version has a chance to spawn a new axe from an old one, up to 4 times, a maximum of 25 (5x5) ethereal green axes.
4) blaster (chaingun) shoots piercing ice spikes, enemies are frozen, the powered version shoots a ball of energy that shoots piercing ice spikes...
5) phoenixRod (rocket launcher) base version shoots a phoenix like rocket missile, powered version is a high damaging short range flamethrower.
6) skullrod/hellstaff (plasmagun) shoots 2 shots at a time, the powered version has those deal huge damage and conjure a piercing hellfire rain
7) lightbringer (new ultimate weapon like bfg) base version has a weak whole screen area insta kill effect (it takes more than 1 shot to kill medium and strong foes), powered shoots 12 seeking bouncing heavy damage lights
7) mace (discarded concept for the bfg) base version shoots bouncing exploding steel balls, powered version shoots spheres who spawns new spheres each bounce; spheres do not have any effect on ghosts.
9) book of shadows (summoning weapon) base version summons 3 ghosts with 2 hellpoison attacks, the powered version has a hexen's wraithverge effect with invulnerable ghosts seeking and destroying nearby monsters.
0) lightning spell (innate ability) base is a sniping shot (altfire for zoomed shot), powered shoots 24 bouncing balls spaced in a 360 degree arc.

Mo:
monsters drop list:

E1
gargoyle (leader): nothing
golem (leader, ghost): GoldWandAmmo2, GoldWandHefty2, ArtiHealth
undead warrior (ghost): CrossbowAmmo2, CrossbowHefty2, ArtiInvisibility
centaur (leader/ghost): SilverShield2, EnchantedShield2, ArtiPowerBracers
disciple: BlasterAmmo2, BlasterHefty2, ArtiTomeOfPower
iron lich (boss): BookOfShadowsAmmo2, BookOfShadowsHefty2, ArtiEgg
-----------------------------------------------------
E2
weredragon: PhoenixRodAmmo2, PhoenixRodHefty2, ArtiTimeBomb (doesn't drop CrossbowAmmo)
sabreclaw: SkullRodAmmo2, SkullRodHefty2, EmeraldBottle
maulotaur (boss): MaceAmmo2, MaceHefty2, ArtiSuperHealth (doesn't drop PhoenixRodAmmo)
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E3
ophidian: LightbringerAmmo2, LightbringerHefty2, RubyJar
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drop rate:
golem 25%[64] for minor ammo, 2 chances and 5%[13] for maior ammo, 2 chances
undead warrior 25%[64] for minor ammo, 1 chance and 5%[13] for maior ammo, 1 chance
disciple 25%[64] for minor ammo, 3 chances and 5%[13] for maior ammo, 3 chances
ironlich 25%[64] for minor ammo, 2 chances and 5%[13] for maior ammo, 2 chances
weredragon 25%[64] for minor ammo, 2 chance and 5%[13] for maior ammo, 2 chance
sabreclaw 25%[64] for minor ammo, 2 chances and 5%[13] for maior ammo, 2 chances
maulotaur 25%[64] for minor ammo, 2 chances and 5%[13] for maior ammo, 2 chances
ophidian 25%[64] for minor ammo, 2 chances and 5%[13] for maior ammo, 2 chances

nitrogolem replaces golem, hexen's slaughtaur replaces nitrogolem

undead warrior's axes deal extra damage to ghosts/ethereal beings

gargoyles are weak to ice (blaster) and resistant to firenotlava/fire (phoenix rod)
golems are weak to earth (goldwand) and resistant to ice (blaster)
undead warriors are weak to melee (melee/staff) and resistant to hellfire (skullrod/hellstaff)
centaurs are weak to electric (lightning spell) and resistant to earth (goldwand)
disciples are weak to dark (bookofshadows powered attack) and resistant to light (lightbringer)
iron liches are weak to light (lightbringer) and resistant to dark (bookofshadows)
weredragons are weak to hellfire (skullrod/hellstaff) and resistant to melee (melee/staff)
sabreclaws are weak to poison/hellpoison (bookofshadow base summon's attacks) and resistant to arcane (gauntlets)
maulotaurs are weak to steel (mace) and resistant to poison/hellpoison (bookofshadow base summon's attacks)
ophidians are weak to firenotlava/fire (phoenixrod) and resistant to electric (lightning spell)
ghosts are weak to ethereal (crossbow) and immune to steel (mace)
undead/constructs (golems/undead warriors/iron liches/sabreclaws/ghosts) are immune to the poison cloud (emerald bottle/sabreclaw death)

barrels are replaced with exploding barrels (source is preacher.wad mod for doom 2, it used heretic barrel graphic)

sources that i could remember:
hexen.wad for afrit, centaur, reiver, fletchette, wraithverge projectile, lightning spell weapon, dragonskin bracer sprite and some other sprites and sounds
preacher.wad for heretic exploding barrel
Food Barrel.wad for the concept that you can also replace decorations in addition to weapons/ammos/monsters/projectiles/pickup items
lightbringer.wad for the lightbringer weapon
necronomicon.wad for the book of shadows weapon
HRWIDE10.WAD for fixed staff/powered staff attack with minimal hud in widescreen
wayfarer.wad for the concept and code to bring the doom's berserk powerup in heretic
APOTHEOSIS.wad for the lightning ball, used in the powered version of lightning spell to create the 24 bouncing missiles firing in a 360 circle, each spaced 15 degrees from the others.
FrostFang.wad for the ice shard used as blaster projectiles, and for the ammo sprites of the lightning spell (those do not spawn but are given at start of the game (100) or while wielding a powered staff (4 each tick))
Thunder Fork.wad for the base lighting spell projectile (sprite/sound/code)
osjc_ZHER9.pk3 for the alternate skullrod/hellstaff and the alternate crossbow
potions.wad potions' sprites and how to code them, especially regenerating potion
ghoul.wad for the double missile poisoning attack
dark gargoyle for the concept and code of a 50% 50% attack1 or attack2, and the fireball attack that has been morphed into a poison ball attack using hexen.wad heresiac + ghoul.wad additional resources
HereticPlus.pk3 and Realm667.com (https://realm667.com/index.php/en/armory-mainmenu-157-97317/heretic-hexen-style-mainmenu-159-20295#preview-7) for collecting many wads in one single place
mut_*.pk3 files for the concept of having autoload compiled acs scripts which made possible having the mystic urn autouse itself on the brink of death with some help from a respawn heal code found on the internet.