The value of Chatras is that it makes the Battle Elephants highly resilient, and for a civilization like Vietnamese that requires support for their archers from other troops, having a tanky unit is a great advantage, as Battle Elephants can act as meat shields that guard the ranged units. A fully upgraded Elite Battle Elephant with both Bloodlines and Chatras researched will have 420 HP, a value that is only beaten by the normal War Elephant (470 HP) and the Elite War Elephant (620 HP).
Rise of the Rajas
- Initially, Chatras gives Battle Elephants +30 HP. With patch 5.7, Chatras now gives +50 HP.
Dawn of the Dukes
- With update 54480, Chatras now gives +100 HP.
A Chatra (Sanskrit: छत्त्र, Hindi: छत्र, lit. "umbrella") is an ornament with special cerimonial and symbolic valour to Hindu, Jain, and Buddhist traditions. It was and is used as royal regalia in Thailand. It doesn't seem to have had a practical use in battle.