| alexd1976 |
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They do totally different things, they don't "stack", but they will both be able to be used on the same spell.
Whoever told you they can't be used together should provide you with the information they are basing their false assumption on.
One trait modifies how metamagic works on a spell, they other trait modifies the caster level of two spells.
The traits are in no way conflicting. They can both apply.