Buy RS3 Phoenix necklace
The Phoenix necklace is a members-only necklace in RuneScape 3 that can save your life in a fight. When your life points fall below 20% of your maximum, the necklace heals you for 30% of your maximum life points. It works one time, then it is destroyed.
Here is an example. A player with 9900 maximum life points takes a hit and drops under 1980 life points. The necklace then heals 2970 life points. If a hit takes you all the way to 0, you die and the necklace is not used. The necklace has a 1 minute cooldown. If you also wear a ring of life, the Phoenix necklace activates first.
This necklace even works in Dominion Tower fights with the No Food handicap active. It is worn in the necklace slot, weighs 0.01 kg, and is tradeable and noteable. Players can also make one by casting Lvl-4 Enchant on a diamond necklace with level 57 Magic.
Keep a Phoenix necklace on for tough bosses and risky fights. It gives you a second chance when a big hit almost takes you down.