Can someone explain to me when the "invasion" casus belli appears?

[hannibal_barca]

I notice it sometimes appears and disappears even with the same sovereigns are in power. Does it have to do with piety ?

 

[heliostellar]

I notice it sometimes appears and disappears even with the same sovereigns are in power. Does it have to do with piety ?

I thought it had something to do with when you have a stronger claim than the current heir, but I could be wrong on that.

 

[heliostellar]

Hmmm... in looking at the files, I think it has something to do with Prestige being at or above 200. It also mentions something about scaled Prestige. I've modded other Paradox games, but I'm not familiar with all of the syntax in here that looks like it's specific to CK2.

Here's what I found:

Spoiler

invasion = {
name = CB_NAME_INVASION
war_name = WAR_NAME_INVASION
sprite = 7
truce_days = 3650
hostile_against_others = yes
can_ask_to_join_war = no

can_use_title = {
OR = {
FROM = {
has_landed_title = PREV
}
holder_scope = {
is_liege_or_above = FROM
}
}
}

is_valid_title = {
OR = {
FROM = {
has_landed_title = PREV
}
holder_scope = {
is_liege_or_above = FROM
}
}
}

on_success = {
ROOT = {
prestige = 200
}
any_attacker = {
limit = { character = ROOT }
participation_scaled_prestige = 200
}
any_attacker = {
limit = { NOT = { character = ROOT } }
hidden_tooltip = { participation_scaled_prestige = 200 }
}

hidden_tooltip = {
ROOT = {
occupy_minors_of_occupied_settlements = FROM
gain_all_occupied_titles = FROM
give_nickname = nick_the_conqueror
}
ROOT = {
if = {
limit = {
has_dlc = "Legacy of Rome"
OR = {
has_landed_title = e_byzantium
has_landed_title = e_roman_empire
}
religion_group = christian
}
character_event = { id = LoR.30 days = 12 }
}
}
}

FROM = {
prestige = -200
}
}

on_success_title = {
custom_tooltip = invasion_succ_tip

hidden_tooltip = {
usurp_title_plus_barony_if_unlanded = ROOT
FROM = { set_defacto_liege = ROOT }
if = {
limit = {
FROM = { is_liege_or_above = ROOT }
}
FROM = { imprison = ROOT }
}
}

if = {
limit = {
higher_tier_than = BARON
NOT = { culture = ROOT }
}
hidden_tooltip = { conquest_culture = ROOT }
}
}

on_fail = {
ROOT = {
prestige = -200
}
FROM = {
prestige = 100
}
any_defender = {
limit = { character = FROM }
participation_scaled_prestige = 100
}
any_defender = {
limit = { NOT = { character = FROM } }
hidden_tooltip = { participation_scaled_prestige = 100 }
}
}

on_reverse_demand = {
ROOT = {
prestige = -200
transfer_scaled_wealth = {
to = FROM
value = 8.0
}
}
FROM = {
prestige = 200
}
any_defender = {
limit = { character = FROM }
participation_scaled_prestige = 200
}
FROM = {
if = {
limit = {
has_dlc = "Legacy of Rome"
OR = {
has_landed_title = e_byzantium
has_landed_title = e_roman_empire
}
religion_group = christian
}
hidden_tooltip = { character_event = { id = LoR.30 days = 12 } }
}
}
any_defender = {
limit = { NOT = { character = FROM } }
hidden_tooltip = { participation_scaled_prestige = 200 }
}
}

on_reverse_demand_title = {
ROOT = {
remove_claim = PREV
}
}

on_attacker_leader_death = {
hidden_tooltip = {
any_defender = {
letter_event = {
id = 251
}
}
}

end_war = whitepeace
}

attacker_ai_victory_worth = {
factor = 150
}

attacker_ai_defeat_worth = {
factor = 100
}

defender_ai_victory_worth = {
factor = -1 # always accept
}

defender_ai_defeat_worth = {
factor = 100
}
}

 

[hannibal_barca]

thanks a lot, im going to keep an eye out for that