Here is a list of Quake entities that were dropped from Hexen II.
If anyone wants to contribute erudite essays on the differences between
shared entities in Quake and Hexen II, that would be cool.
air_bubbles
ambient_comp_hum
ambient_drip
ambient_drone
ambient_suck_wind
ambient_swamp1
ambient_swamp2
event_lightning
func_bossgate
func_episodegate
info_intermission
info_player_start2
item_armor1
item_armor2
item_armorInv
item_artifact_envirosuit
item_artifact_invisibility
item_artifact_invulnerability
item_artifact_super_damage
item_cells
item_key1
item_key2
item_rockets
item_shells
item_sigil
item_spikes
item_weapon
light_flame_small_white
light_fluoro
light_fluorospark
light_globe
misc_explobox
misc_explobox2
misc_fireball (present in hcode, but not finished)