“I see you’ve made your resolve. Bishop Saias was right, you really have grown up. Very well, then... Suit yourself.”
—Reinhardt to Olwen, when they meet on the battlefield
Reinhardt (ラインハルト Rainharuto, fan translated as Rinehart) is an enemy character from Fire Emblem: Thracia 776. Said to be the second coming of the Crusader Tordo, he is the leader of the Gelben Ritter in the Freege army and has been Ishtar's personal guardian since childhood. He is also the older brother of Olwen, who initially admires him. Kempf despises him out of envy and views him as a rival.
At the Great River of Thracia, he leads the Gelben Ritter into battle against the Liberation Army.
Reinhardt first appears at Ishtar's side when she arrives in Leonster to ask Bishop Saias to aid Prince Julius, who has fallen ill. He is later mentioned in Chapter 21x, in which Julius reveals his jealousy of him due to his relationship with Ishtar. At the start of Chapter 22, he speaks with Saias, who tells them that Olwen has chosen her own path, which includes standing against the Grannvale Empire. Afterwards, he leads the Gelben Ritter into a battle against the Liberation Army at the Great River of Thracia.
If Olwen speaks to Reinhardt during the chapter, he attempts to persuade her to leave the Liberation Army, but to no avail. As a parting gift, he gives the Holy Sword to Olwen, which was in turn given to him by Ishtar.
In terms of one-on-one combat, Reinhardt is probably the strongest boss in the game. He has four powerful skills, a Dime Thunder tome, a Master Sword, five leadership stars, five movement stars, a PC of 2 (an utter rarity among bosses), and high stats to boot. If you have been using Olwen with the Ambush + Dime Thunder combo, Reinhardt has that too, but he is stronger than her thanks to his skills.
Reinhardt will not attack his sister Olwen, so first have her talk to Reinhardt to obtain the Holy Sword. After this, based on Olwen's stats, she could potentially defeat Reinhardt by herself. If not, it is advisable to inflict Reinhardt with some kind of stat condition (have the status inflicter be boosted by the Magic Up Staff or Pure Water) and finish him off. Because Cowen possesses a Berserk Staff, the player should have access to status conditions so long as Tina has enough magic to steal it after receiving a magic boost. A berserked Rinehart could theoretically destroy his entire battalion and even capture Cowen. When and if he is defeated, usually as a result of ballista shots, what remains of his squadron will leave the field .
If neither option is suitable, you should boost Tina's magic with a Magic Up Staff and have her steal his Dime Thunder so you can finish him off with ranged attacks. Another option is to put Mareeta in range to attack him with Mareeta's Sword. Since it has Awareness, it will disable his skills.
Another way to weaken him is to use a character with no weapons or items to act as bait for Reinhardt. Reinhardt will capture them which will lower his stats, allowing him to be defeated easier. However, this risks losing a unit if Reinhardt manages to escape.
“So this...is...the end...”
—Reinhardt`s death quote
—Reinhardt's quote after being released