Error Log: http://pastebin.com/9fxtvbTx
Modpack: AllTheMods v1.39
Botania Version: 1.9 335

I placed a spreader down, then placed a mana pool on top, then placed 24 endoflames around it. I threw down 64 lava crystals (from Armor+) and when the spreader sent a mana burst I crashed. Logged back in and crashed again as soon as it sent another burst.

That might be a bug with the mana pool being directly above the spreader. Can you try one block gap between spreader and pool?

i think this is another mod messing with the entitythrowable datawatcher

What williewillus said.

This is also happening in FTB Infinity Lite 1.10.2

Summary of the problem Client crashes from Botania Mana Bursts

Pack Version 1.0.1

What is the bug? When a mana burst happens, everyone in the area crashes. This has happened to half a dozen people on our fresh server (less than 24 hours old.) so far all setups involve endoflames with a spreader set a few blocks from mana pools.

Mod & Version Botania r1.9-337

Link to log file https://gist.github.com/Saereth/c32000d72e3a817f8f98fb69d8411801

Is it repeatable? Yes

Known Fix? none.

I've reported this with the pack devs so they can examine possibly conflicting mods but also reporting here.