How do I increase my stamina in Shadow of the Colossus?
Shadow of the Colossus Guide and Walkthrough
Increasing your strength
The above map reveals the location (more-less accurate) of Silver Lizards. Without the artefact described below, you may have major difficulties with tracking these creatures. Numbers marked next to the icons indicate that more than one Lizard can be found in the given location.
Your strength is an important attribute - it governs how long you can continue holding onto a colossus during combat. To increase its level, you need to find lizards with glowing tails. In all, there are 77 lizards in game.
Lizards are often encountered on fields and meadows, but only some of them will help you attain your goal. To kill a lizard, simply hit it with a sword or an arrow and pick-up (R2) the leftover tail. The amount of unique lizards is limited - you can view their locations at the beginning of each chapter. Defeat 8 colossi in Time Attack mode on Normal difficulty level to receive a Lizard Stone, which displays the locations of the nearby "unique" lizards. Each altar contains at least a single lizard (often found climbing on the nearby walls). This is the easiest way of gaining additional strength.