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<blockquote data-quote="KarinsDad" data-source="post: 2650723" data-attributes="member: 2011">Grease is only on the lower surface.Part of the swarm is standing on other parts of the swarm.Your assumption is that it is a washing machine of creatures where all of them would go from the top and back to the bottom, hence, all of them would eventually get greased.I think an assumption that they cannot be tripped / cannot be bullrushed = cannot be knocked prone = cannot fall down, makes more sense than your assumption that greased ones on the bottom means that ones on the top will be greased as well.Grease is a 2 dimensional spell. The swarm is 3 dimensional.PS. I would also rule that cannot be tripped / cannot be grappled / cannot be bullrushed (MM page 316) also means that they cannot be overrun.It doesn't make sense that you could knock down an entire swarm by running through them. Some would get &quot;knocked down&quot;, but the majority of the swarm would just swarm over you.Just like with Grease, some would get &quot;greased&quot;, but the majority of the swarm would not be affected.If you had a 3 dimensional area effect spell that knocked down all creatures (i.e. affected the creatures themselves), that would be different. But, Grease is a spell that affects a surface or a single object, not a group of creatures.Let me give you another example.Say you had a poisonous floor. If you cast Summon Swarm on it, the ones on the bottom die. The ones above do not. They are standing on the bodies of the dead ones, not the floor. For all intents and purposes, the swarm is not affected by the floor.</blockquote>

[QUOTE="KarinsDad, post: 2650723, member: 2011"] Grease is only on the lower surface. Part of the swarm is standing on other parts of the swarm. Your assumption is that it is a washing machine of creatures where all of them would go from the top and back to the bottom, hence, all of them would eventually get greased. I think an assumption that they cannot be tripped / cannot be bullrushed = cannot be knocked prone = cannot fall down, makes more sense than your assumption that greased ones on the bottom means that ones on the top will be greased as well. Grease is a 2 dimensional spell. The swarm is 3 dimensional. PS. I would also rule that cannot be tripped / cannot be grappled / cannot be bullrushed (MM page 316) also means that they cannot be overrun. It doesn't make sense that you could knock down an entire swarm by running through them. Some would get "knocked down", but the majority of the swarm would just swarm over you. Just like with Grease, some would get "greased", but the majority of the swarm would not be affected. If you had a 3 dimensional area effect spell that knocked down all creatures (i.e. affected the creatures themselves), that would be different. But, Grease is a spell that affects a surface or a single object, not a group of creatures. Let me give you another example. Say you had a poisonous floor. If you cast Summon Swarm on it, the ones on the bottom die. The ones above do not. They are standing on the bodies of the dead ones, not the floor. For all intents and purposes, the swarm is not affected by the floor. [/QUOTE]

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