Grendel on Alpha has 600k health, making it one of the squishier bosses. However, don’t be fooled as it can heal quickly. The minions, deinonychus and vultures, are level 500 and thus very strong. When you light the highlighted cauldron, Grendel cloaks to you and your army can attack him for a short time until the fire runs out, making Grendel cloak away. I’d recommend bringing an army that can heal quickly, like a Theri army with veggie caked or one that can dish out a lot of damage, like the Deinosuchus, as both Grendel and the Deinonychus deal bleed damage. Be careful of the vultures attacking you too! Grendel drops 520 element when killed.