Chapter 23: Four_fanged Offense(Linus)

Objective	Boss	Units allowed	Units gained
Defeat the enemy hero, Linus	Linus	12	Geitz(speak with Dart)
Items droped by emeny	Items that you can steal from enemy		Chest/Village
None	Red Gem		Earth Seal, Silence, Orion's Bolt
Initial Enemy		Reinforcements
9 Mercenary, 5 Corsair, 2 Wyvern Rider, 2 Archer, 2 Nomad, 2 Mage, 2 Cavalier, 1 Sage		12 Wyvern Rider, 4 Mercenary, 3 Corsair, 1 Warrior(Geitz)

Shops:

Secret		Vendor		Vendor		Armory		Armory
Armorslayer	1260 G	Vulnerary	300 G	Fire	560 G	Iron Sword	460 G	Steel Sword	600 G
Longsword	1260 G	Antitoxin	450 G	Thunder	700 G	Iron Lance	360 G	Lancereaver	1800 G
Heavy Spear	1200 G	Heal	600 G	Lightning	630 G	Javelin	400 G	Steel Lance	480 G
Horseslayer	1040 G	Mend	1000 G	Flux	900 G	Iron Axe	270 G	Axereaver	1950 G
Hammer	800 G	Restore	2000 G			Hand Axe	300 G	Steel Axe	360 G
Halberd	810 G					Iron Bow	540 G	Swordreaver	2100 G
Ocean Seal	50000 G							Steel Bow	720 G

There are 2 different maps for chapter 23, one with Linus and the other with Lloyd as the boss. You'll get this map if the total level of your Lords is 50 and above, Lloyd's map if below 50.
For this map, take your time, the enemies are strong, and they have access to ballistas. Move your troops up north and around the lake to get to Linus.
To recruit Geitz, have Dart speak with him. If your Dart is weak, first move a one-attack-ranged unit into his sight and have Dart next to him out of Geitz's attack range so that Geitz will attack that unit but won't recieve a counter attack, then have Dart speak with him.
This is also the last chapter that you can take full advantage of the arena.

Boss Strategy:
First thing to know, Linus DOESN'T move, so attack him from a distance using a 2-ranged weapon, and he won't counter attack because the silver blade is epuiped. On his turn, he'll most likely use the hand axe, which has less attack points than the silver blade, so your unit will have a better chance of surviving, and counter attack to finish him off.