Whispike Survivors - Sword of the Necromancer

After you die playing a map, it will give you a seed for a new Whispike to plant. The seed you get will have some or all of the abilities you had in your run when you plant it. Once you wait long enough or feed it enough manure for it to grow into an adult then you can use that Whispike and have a few abilities to start your next run with. At first, manure doesn't accumulate a lot, but once you start gaining more and more then farming will be much easier.

Be careful though. Once you have an adult Whispike in your farm it will force you to start the next game with that adult. Don't worry too much though; this is part of the farming method I'll outline in  Attack on Whispike (90G). When you use the adult and do your next game, as long as you die before you make it to the end, then you should get another seed with more of the abilities and levels you got during the run. I found out that if you complete the time limit, for example in Alas Forest of five minutes, and the Necromancer kills you, then you don't get a new seed. So essentially you can do a run and get abilities and level them and when you die plant the seed and grow it to adult with manure and use it again. Just don't die by Necromancer. You just keep doing that. I'll explain more in the other achievement description.

Once your new Whispike is adult, I can't remember if you get the achievement for growing it or if you have to use it also. Either way, that's what it means by Hybrid. Just get one and use it and the achievement is yours.