I found out that the broken floor tiles you find at Waypoints and some boss rooms like Malugaz actually give you XP. Malugaz is actually a pretty good leveling spot.

The trick is to get as much Explosive Radius as possible. Bomb Necklace gives you 22% and Blast armor set effect gives you another 31%, then get your damage as low as possible. A low level Hand Mortar is perfect for this. Conveniently the mortar also frequently drops from Malugaz so once you break one, just delete it and equip another.

The fire ground effect from Malugaz doesn't seem to give you XP despite it taking damage. Anyway, placing floor tiles down is actually inefficient but if you're leveling it at Malugaz, there's a bit of a delay between boss spawns after you kill him and you can use that time to put down the broken tiles next to walls, lure him on top of them after he spawns and then blow him up. If you're standing close enough to him, you'll take damage from your own mortar which also gives you XP.

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A good method is farming with king slime boss due to the mini slimes that he summons, or the hive mother for the same reason, it has the same ratio of leveling up as the snails

cool

hive boss spawns so many maggots i found it fairly effective

a very nice guide, keep it up