Block'oMorph

You can now turn into multi-blocks such as doors, beds, 2 block plants and other blocks that place extra blocks after placement. The mod supports multiblocks even more than 2 blocks, for example: You can enable multiblock mode by clicking on the red button in the block configuration screen if it is available or by typing the command /blockmorph <blockstate> <player> true. This function can be disabled in the mod parameters, parameter - advancedMode

Now when you transform into an anvil you can deal damage to mobs when you fall: