Reward
Step 1 The hydra cave north-east of Jungle
About 40 squares north-east of the Jungle temple go down the stairs at 31486,32418 and on floor 8 take the stairs at 31498,32412 down to floor 9.
Step 2 The chest
Walk south through the hydra cave. The shield of honour lies in the chest at 31498,32466 (floor 9), from level 40. Many hydras live in the cave, three of them right next to the chest.