Valkyrie.

Pre-Mission Advice: Perform a mock Training Battle at Gruborza Plains. Use a Wizard with FireBurn on Team 1 and Denim/others on Team 2. Near the Wizard's starting position, on the left, is a plateau (4H elevation) with Buried Treasure. Aim to acquire the Vitalize spell from here. Save your game beforehand.

Strategy: Position your units carefully, with those to Denim's right being the 'back' row. Choose to help the woman at the start of the battle. Enemies like Soldiers and Amazons have Chain Armour, which is superior to Leather Armour. Consider persuading at least one enemy or saving before killing them to obtain their equipment as treasure. A Witch has a Magic Ring, but these can be purchased later. Advance your party forward. Your weaker characters should be protected in the back.

Buried Treasure: There is Buried Treasure on a single-square 'island' in the water to your left, which needs to be burned. Obtain a second Vitalize spell here with your Cleric, saving your game beforehand.

Enemy Levels and Classes: Most enemies, excluding the Witch and Knight, are level 5. Your party benefits from new Classes. The main challenge can be enemy accuracy against Sisteena; save your game to mitigate mistakes or ensure she blocks attacks.

Treasure and Stat Cards: Be aware of enemies or Guests stepping on treasure or Stat Cards, as they move frequently in the confined battle area. Coordinate attacks to ensure your party members, not Guests, deliver the final blow to better track when to save for specific equipment drops.

Healing and Support: With your new Cleric, you have three healers (including Kachua as a Guest) and your Ghost can provide Cures. Leonard can be put to sleep to prevent interference.

Item Drops: While Chain Armour may be difficult to obtain, you might find a Vitality Card (+3) or a Luck Card (+2 for Denim). The goal is to increase Denim's Luck for better Buried Treasure finds and potentially lower a fodder character's Luck for 'worst' treasure drops, which can include stat-increasing items.

Boss Mechanics: When the Knight boss is low on HP, he will use a Cure item to recover 50 HP and retreat.

Experience Gain: Kachua can gain significant EXP for healing higher-level characters. Vice can also gain EXP by defeating enemies. Guests become more useful.

Post-Battle Choice: After the battle, you will be prompted with a choice. Select 'For true peace'.

Post-Battle Random Encounter: You may face a random battle on the way back to Amorika Castle. These foes are easily defeated, and you can acquire Stat Cards.

Amorika Castle: Upon returning to Amorika, you can purchase Spears, Battle Boots (which offer better defense than Leather Armour), and Magic Rings. New supplemental magic spells may also be available, potentially negating the need to buy expensive spells like Heal and Incubus.