The Great Thief - Chapter 6: Opening a Treasure Chest

... long he could stay underwater, which was roughly 30 seconds. After this period, he would start to lose HP.

Seal Transformation!

After casting the skill, Lu Li instantly transformed into a small seal. His body was very smooth and he continued diving towards the bottom of the lake.

There were different kinds of monsters within the lake; like variations of fish, shrimps, crabs and snails. While the transformation reduced aggro, none of the monsters were higher than LV5 ...