XP Table

Feather Bushes are the best source of XP: 10 XP divided by 6 is 1.666... XP for each 1 damage with runner-up being sun trees with XP to health ratio of .35.

The Old God is the former best source of EXP: 350 EXP divided by 5000 is approximately 0.06 EXP per 1 HP attack and 1.2 EXP per God Rock attack. It is even better than the Ancient Tree.