The captured Shrine page covers two things: the King's Protection buff and the upgrade-requirements table (no intro paragraph; the revive-dead-generals role appears only via cross-references, not stated on this page). King's Protection is a temporary 24-hour buff available once the Shrine reaches a threshold level, activating after a required number of Offerings. Thresholds/buffs/offers: Lv27 Ranged Attack +10% (14 offers); Lv30 +Mounted Defense +10% (14); Lv33 +Mounted&Ground Defense +15% (14); Lv35 Ranged&Siege Attack +Mounted&Ground Defense +20% (14); Lv36 +25% (19); Lv39 +30% (24); Lv42 +35% (29); Lv45 +40% (34); Lv48 +45% (39). Keep-gated 1:1 (built at Keep 1), cost/Power to 31,000,000 at Lv50. Cross-referenced (from Hospital/Prison pages): dead/executed generals are revived at the Shrine -- its other core function. This page does not state whether revive is disabled while upgrading; treat that as unverified. Offering at the Shrine is also a common event-scoring action (Alliance Competition, Revelation of Horus, Dawn of Civilization) and a small daily gem source -- a good daily-collect action for a bot.
Original research source: Evony Guide Wiki