is mount_effect ap damage or just adds to regular damage?

**The Great Khan of Rome** · March 23, 2020, 12:29 AM

from EBI (pretty much the same in M2TW):

Code:

type             african elephant bushdictionary       african_elephant_bush      ; African Bush Elephants
category         cavalry
class            heavy
voice_type       Medium_1
soldier          hellenic_elephant_archer, 8, 8, 1
mount            elephant african
mount_effect	 chariot -4 
attributes       sea_faring, can_run_amok, frighten_foot, frighten_mounted, hardy
formation        7, 11, 13, 16, 1, square
stat_health      5, 5
stat_pri         9, 45, normal_arrow, 136, 11, missile, archery, piercing, none, 1 ,1.31
stat_pri_attr    no
stat_sec         45, 45, no, 0, 0, melee, other, blunt, none, 0 ,2
stat_sec_attr    area, launching
stat_pri_armour  25, 25, 0, leather
stat_sec_armour  25, 25, leather
stat_heat        0
stat_ground      0, 0, -5, -4
stat_mental      8, normal, untrained
stat_charge_dist 15
stat_fire_delay  0
stat_food        0, 0
stat_cost        3, 1500, 200, 750, 750, 1500
ownership        egypt, numidia, saba, slave

is mount_effect just added (or in this case subtracted) onto the regular damage or is it separate AP damage? does it also affect morale (it increases morale with positives or decreases with negatives vs the specified unit type?)