Gabruche

This tree, which trunk measures up to 6 feet in diameter, is better known in some regions as the "tree of the braves". It is sought after for the virtues of its bark. A large quantity of bark is necessary to prepare its decoction which is generally made in a large cauldron to draw an elixir which will ultimately only fill a few vials. This elixir has the power to increase physical resistance. Many fighters are fond of it and do not hesitate to spend large sums to obtain it.
Drinking a gabruche decoction grants 1 temporary hit point per level. These points persist until the first strike that hits the subject, regardless of the amount of damage taken, or for a maximum of 10 minutes if no damage is taken during that time.