This quest is only available on PC for a Limited Time
If you don’t already use Medal, it’s the best way to record and edit Minecraft videos. You must install it on PC for this offer, you will not see the quest on mobile.
After installing Medal on PC, go to Home in the Medal app and then navigate to the Quests sidebar on the right. Click on Lifesteal x Medal quest and click "Start Quest"
Once the quest is started, launch Minecraft and log in to lifesteal.net then press F8 to save the past 15s of gameplay. Once you capture a clip, post it to your profile with hashtag #lifesteal in the description.
Once you've posted your clip, go to the Medal homepage and look for the Lifesteal quest in the sidebar. Enter your Minecraft username that you want to claim the reward for then click submit.
Once you have entered your username on the Medal quest, now go back to Lifesteal.net and then type the command /medal to redeem your spawners!