tournament_winner_prestige_rewards_effect

tournament_winner_prestige_rewards_effect = {
	if = {
		limit = { scope:activity.num_phases > 4 }
		add_prestige = scope:host.massive_prestige_value
		if = {
			limit = { exists = dynasty }
			dynasty = { add_dynasty_prestige = scope:host.minor_dynasty_prestige_gain }
		}
		# If appropriate, give the winner's liege a reward too.
		tournament_contest_rewards_give_liege_prestige_effect = {
			AMOUNT = tournament_first_place_reward_prestige_major_value
			TOOLTIP = tournament_landless_knight_liege_rewards.tt.tournament_first_place_reward_prestige_major
		}
	}
	else_if = {
		limit = { scope:activity.num_phases > 3 }
		add_prestige = scope:host.major_prestige_value
		# If appropriate, give the winner's liege a reward too.
		tournament_contest_rewards_give_liege_prestige_effect = {
			AMOUNT = tournament_first_place_reward_prestige_medium_value
			TOOLTIP = tournament_landless_knight_liege_rewards.tt.tournament_first_place_reward_prestige_medium
		}
	}
	else = {
		add_prestige = scope:host.medium_prestige_value
		# If appropriate, give the winner's liege a reward too.
		tournament_contest_rewards_give_liege_prestige_effect = {
			AMOUNT = tournament_first_place_reward_prestige_minor_value
			TOOLTIP = tournament_landless_knight_liege_rewards.tt.tournament_first_place_reward_prestige_minor
		}
	}
}

As written in game/common/scripted_effects/04_dlc_ep2_tournament_effects.txt.