Will the AI accept Grant …'s Blessing?

Yes: it is accepted automatically.

Interaction · Religious actions

Grant …'s Blessing

500PietyBy God AloneAccepted automatically

Grant the Holy Blessing Doctrine to …, reducing its Divergence.

What you need

You

You are the Head of Faith

The character you target

To send it

… must be a Head of Rite

To see it in the menu

rite.head_of_rite ?= this
Their faith is the same as that of actor
Their rite: Does not have the Holy Blessing Doctrine
Is played by the AI

Grant …'s Blessing is a religious character interaction in Crusader Kings III. Accepted automatically. It costs 500 Piety. It needs By God Alone. Patch 1.20.1.2, from game/common/character_interactions/pam_interactions.txt.

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Quick answers (2)

Will the AI accept Grant …'s Blessing?: Yes: it is accepted automatically.
How much does Grant …'s Blessing cost?: 500 Piety (patch 1.20.1.2).

Will they accept?

The other character has no choice: the game accepts it automatically.

What happens

Effects

Your faith: Fervor decreases by -3
The character you target:
- Opinion: Grateful (+15)
- Their rite:
  - add_rite_doctrine = special_doctrine_pope_blessing

• the game's own tooltip text · ◦ our reading of the script line · code the script where neither exists

Who can use it and sees it (is_available, is_shown) (13 lines of game script)

is_available = faith.religious_head ?= this
has_pam_dlc_trigger = yes
is_shown = scope:recipient = {
	rite.head_of_rite ?= this
	faith ?= scope:actor.faith
	this != scope:actor
	rite ?= {
		NOT = {
			rite_has_doctrine = special_doctrine_pope_blessing
		}
	}
	is_ai = yes
}

As written in game/common/character_interactions/pam_interactions.txt.

Can be sent when (is_valid…) (7 lines of game script)

scope:recipient = {
	is_alive = yes
	custom_tooltip = {
		text = grant_pope_blessing_hor_tt
		rite.head_of_rite ?= this
	}
}

As written in game/common/character_interactions/pam_interactions.txt.

Effects (on_send, on_accept, on_decline) (24 lines of game script)

on_accept = scope:actor = {
	send_interface_toast = {
		title = grant_pope_blessing_toast_title
		desc = grant_pope_blessing_toast_desc
		left_icon = scope:actor
		right_icon = scope:recipient
		faith = {
			change_fervor = {
				value = notable_fervor_loss
				desc = fervor_loss_grant_pope_blessing
			}
		}
		scope:recipient = {
			add_opinion = {
				target = scope:actor
				modifier = grateful_opinion
				opinion = 15
			}
			rite = {
				add_rite_doctrine = special_doctrine_pope_blessing
			}
		}
	}
}

As written in game/common/character_interactions/pam_interactions.txt.

Category: Religious actions
Cost: Piety: 500
DLC: By God Alone
In the menu: under More…
ID: grant_pope_blessing_interaction

Source: game/common/character_interactions/pam_interactions.txt and the English localisation, Crusader Kings III 1.20.1.2. “You” is the character who sends it (scope:actor, or a puppet acting for you); “the character you target” is the recipient. “…” marks words the game fills in at play time (a name, a title).